diff --git a/.github/scripts/check_appimage_elf.py b/.github/scripts/check_appimage_elf.py
new file mode 100644
index 00000000..4f131dcf
--- /dev/null
+++ b/.github/scripts/check_appimage_elf.py
@@ -0,0 +1,33 @@
+"""Reject foreign ELF files in a native AppDir without executing any binary."""
+import argparse
+from pathlib import Path
+import struct
+
+
+def check(directory, architecture):
+    expected = {'x86_64': 62, 'aarch64': 183}[architecture]
+    checked = 0
+    for path in Path(directory).rglob('*'):
+        if path.is_symlink() or not path.is_file():
+            continue
+        with path.open('rb') as stream:
+            header = stream.read(20)
+        if not header.startswith(b'\x7fELF'):
+            continue
+        if len(header) != 20 or header[5] not in (1, 2):
+            raise ValueError(f'Invalid ELF header: {path}')
+        machine = struct.unpack('<H' if header[5] == 1 else '>H', header[18:20])[0]
+        if machine != expected:
+            raise ValueError(f'Foreign ELF machine {machine} in {architecture} AppDir: {path}')
+        checked += 1
+    if not checked:
+        raise ValueError('No native ELF files found in AppDir')
+    return checked
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument('directory', type=Path)
+    parser.add_argument('architecture', choices=('x86_64', 'aarch64'))
+    args = parser.parse_args()
+    print(f'PASS: {check(args.directory, args.architecture)} native ELF files')
diff --git a/.github/scripts/smoke_native_apprun.sh b/.github/scripts/smoke_native_apprun.sh
new file mode 100644
index 00000000..cb84203c
--- /dev/null
+++ b/.github/scripts/smoke_native_apprun.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+# Exercise the extracted launcher and its real native Python environment,
+# intercepting only the final server exec so no host-monitoring server starts.
+set -eu
+appdir="$1"
+export PMX_SMOKE_PYTHON
+PMX_SMOKE_PYTHON="$(command -v python)"
+fixture_bin="$(mktemp -d)"
+trap 'rm -rf "$fixture_bin"' EXIT
+cat > "$fixture_bin/python3" <<'WRAPPER'
+#!/bin/sh
+case "$1" in
+    */flask_server.py)
+        exec "$PMX_SMOKE_PYTHON" -c 'import gevent, greenlet, geventwebsocket, zope.interface; from PIL import Image; from gevent import pywsgi; print("PASS: extracted AppRun native runtime")'
+        ;;
+    *) exec "$PMX_SMOKE_PYTHON" "$@" ;;
+esac
+WRAPPER
+chmod +x "$fixture_bin/python3"
+PATH="$fixture_bin:$PATH" bash "$appdir/AppRun"
diff --git a/.github/workflows/test-appimage-native.yml b/.github/workflows/test-appimage-native.yml
new file mode 100644
index 00000000..6bbdeba9
--- /dev/null
+++ b/.github/workflows/test-appimage-native.yml
@@ -0,0 +1,79 @@
+name: Native Monitor AppImage validation
+
+on:
+  pull_request:
+    paths:
+      - '.github/workflows/test-appimage-native.yml'
+      - 'AppImage/scripts/build_appimage.sh'
+      - 'AppImage/scripts/appimage_arch.sh'
+      - 'AppImage/scripts/borg_native_arm.sh'
+      - '.github/scripts/smoke_native_apprun.sh'
+      - '.github/scripts/check_appimage_elf.py'
+      - 'AppImage/scripts/AppRun'
+      - 'tests/test_appimage_arch.py'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: native-appimage-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  native-build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - runner: ubuntu-22.04
+            arch: x86_64
+          - runner: ubuntu-22.04-arm
+            arch: aarch64
+    runs-on: ${{ matrix.runner }}
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+      - name: Validate native architecture selection
+        run: |
+          test "$(uname -m)" = '${{ matrix.arch }}'
+          python -B -m unittest discover -s tests -p test_appimage_arch.py -v
+      - name: Refresh package indexes for bundled monitoring tools
+        # Third-party runner repositories occasionally fail; the build reports missing tools.
+        run: sudo apt-get update || true
+      - name: Build native AppImage without publishing it
+        run: bash AppImage/scripts/build_appimage.sh
+      - name: Reject foreign ELF payloads
+        run: python .github/scripts/check_appimage_elf.py /tmp/proxmenux_build/ProxMenux.AppDir '${{ matrix.arch }}'
+      - name: Extract native AppImage without FUSE
+        run: |
+          mkdir /tmp/proxmenux-native-extract
+          cd /tmp/proxmenux-native-extract
+          image=$(find "$GITHUB_WORKSPACE/AppImage/dist" -name '*.AppImage' -type f -print -quit)
+          test -n "$image"
+          chmod +x "$image"
+          "$image" --appimage-extract
+          test -f squashfs-root/usr/bin/flask_server.py
+          test -f squashfs-root/usr/bin/appimage_arch.sh
+          test -f squashfs-root/web/index.html
+      - name: Import bundled Python 3.11 native WebSocket runtime
+        env:
+          PYTHONPATH: /tmp/proxmenux-native-extract/squashfs-root/usr/lib/python3/vendor/cp311:/tmp/proxmenux-native-extract/squashfs-root/usr/lib/python3/dist-packages
+        run: |
+          python -c 'import gevent, greenlet, geventwebsocket, zope.interface; from PIL import Image; from gevent import pywsgi; print(gevent.__version__)'
+          bash .github/scripts/smoke_native_apprun.sh /tmp/proxmenux-native-extract/squashfs-root
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+      - name: Import bundled Python 3.13 native WebSocket runtime
+        env:
+          PYTHONPATH: /tmp/proxmenux-native-extract/squashfs-root/usr/lib/python3/vendor/cp313:/tmp/proxmenux-native-extract/squashfs-root/usr/lib/python3/dist-packages
+        run: |
+          python -c 'import gevent, greenlet, geventwebsocket, zope.interface; from PIL import Image; from gevent import pywsgi; print(gevent.__version__)'
+          bash .github/scripts/smoke_native_apprun.sh /tmp/proxmenux-native-extract/squashfs-root
diff --git a/AppImage/scripts/AppRun b/AppImage/scripts/AppRun
index 74ad4d22..db6e2b6b 100644
--- a/AppImage/scripts/AppRun
+++ b/AppImage/scripts/AppRun
@@ -6,8 +6,11 @@
 # Get the directory where this AppImage is mounted
 APPDIR="$(dirname "$(readlink -f "${0}")")"
 
+source "${APPDIR}/usr/bin/appimage_arch.sh" || exit 1
+pmx_appimage_arch "$(uname -m)" || exit 1
+
 export PATH="${APPDIR}/usr/bin:${PATH}"
-export LD_LIBRARY_PATH="${APPDIR}/usr/lib/x86_64-linux-gnu:${APPDIR}/usr/lib:${APPDIR}/lib/x86_64-linux-gnu:${APPDIR}/lib:${LD_LIBRARY_PATH}"
+export LD_LIBRARY_PATH="${APPDIR}/usr/lib/${PMX_APPIMAGE_TRIPLET}:${APPDIR}/usr/lib:${APPDIR}/lib/${PMX_APPIMAGE_TRIPLET}:${APPDIR}/lib:${LD_LIBRARY_PATH}"
 
 # Select the native dependency tree matching the host interpreter.  PVE 8
 # uses CPython 3.11 and PVE 9 uses CPython 3.13; both runtimes are bundled in
diff --git a/AppImage/scripts/appimage_arch.sh b/AppImage/scripts/appimage_arch.sh
new file mode 100644
index 00000000..ef7b9f84
--- /dev/null
+++ b/AppImage/scripts/appimage_arch.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+# Shared native build/runtime architecture names. No emulated cross-builds.
+pmx_appimage_arch() {
+    case "$1" in
+        x86_64|amd64)
+            PMX_APPIMAGE_ARCH=x86_64
+            PMX_APPIMAGE_TRIPLET=x86_64-linux-gnu
+            PMX_APPIMAGE_SUFFIX=""
+            ;;
+        aarch64|arm64)
+            PMX_APPIMAGE_ARCH=aarch64
+            PMX_APPIMAGE_TRIPLET=aarch64-linux-gnu
+            PMX_APPIMAGE_SUFFIX=-aarch64
+            ;;
+        *)
+            echo "Unsupported Monitor AppImage architecture: $1" >&2
+            return 1
+            ;;
+    esac
+}
diff --git a/AppImage/scripts/borg_native_arm.sh b/AppImage/scripts/borg_native_arm.sh
new file mode 100644
index 00000000..ba49b8ba
--- /dev/null
+++ b/AppImage/scripts/borg_native_arm.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+# Borg 1.2.8 has no official ARM64 standalone release. Never ship or run
+# its AMD64 executable on ARM; use the host's native distro package instead.
+if [ -x /usr/bin/borg ]; then
+    # The distro package must use its own Python modules and shared libraries.
+    unset PYTHONPATH PYTHONHOME LD_LIBRARY_PATH
+    exec /usr/bin/borg "$@"
+fi
+echo 'Native Borg is unavailable. Install the native borgbackup package on this host to use Borg backups.' >&2
+exit 127
diff --git a/AppImage/scripts/build_appimage.sh b/AppImage/scripts/build_appimage.sh
index 3ccf3d66..be49cf1c 100755
--- a/AppImage/scripts/build_appimage.sh
+++ b/AppImage/scripts/build_appimage.sh
@@ -8,6 +8,8 @@ set -e
 WORK_DIR="/tmp/proxmenux_build"
 APP_DIR="$WORK_DIR/ProxMenux.AppDir"
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/appimage_arch.sh"
+pmx_appimage_arch "$(uname -m)" || exit 1
 DIST_DIR="$SCRIPT_DIR/../dist"
 APPIMAGE_ROOT="$SCRIPT_DIR/.."
 
@@ -24,7 +26,7 @@ ZOPE_EVENT_VERSION="6.2"
 GEVENT_WEBSOCKET_VERSION="0.10.1"
 
 VERSION=$(node -p "require('$APPIMAGE_ROOT/package.json').version")
-APPIMAGE_NAME="ProxMenux-${VERSION}.AppImage"
+APPIMAGE_NAME="ProxMenux-${VERSION}${PMX_APPIMAGE_SUFFIX}.AppImage"
 
 echo "🚀 Building ProxMenux Monitor AppImage v${VERSION} with hardware monitoring tools..."
 
@@ -33,17 +35,18 @@ echo "🚀 Building ProxMenux Monitor AppImage v${VERSION} with hardware monitor
 # under the non-root GitHub Actions runner — previously hardcoded to
 # /var/cache/, which the CI user can't write to (mkdir Permission
 # denied → build aborted before doing any actual work).
-APPIMAGETOOL_CACHE="${XDG_CACHE_HOME:-$HOME/.cache}/proxmenux-build/appimagetool"
+APPIMAGETOOL_CACHE="${XDG_CACHE_HOME:-$HOME/.cache}/proxmenux-build/appimagetool-${PMX_APPIMAGE_ARCH}"
 
-# Preserve a cached copy of appimagetool across builds. wget -q has bitten
-# us repeatedly when GitHub momentarily rate-limits or the runner has no
-# network — the result is a 0-byte file that passes the `[ -f ]` check on
-# the next run and breaks the build silently.
-if [ -f "$WORK_DIR/appimagetool" ] && [ -s "$WORK_DIR/appimagetool" ]; then
-    mkdir -p "$(dirname "$APPIMAGETOOL_CACHE")"
-    cp -f "$WORK_DIR/appimagetool" "$APPIMAGETOOL_CACHE"
+APPIMAGETOOL_URL="https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-${PMX_APPIMAGE_ARCH}.AppImage"
+if [ "$PMX_APPIMAGE_ARCH" = aarch64 ]; then
+    # The old AppImageKit ARM build does not accept ARCH=aarch64 reliably.
+    # Use a versioned tool; leave the existing AMD64 tool unchanged.
+    APPIMAGETOOL_URL="https://github.com/AppImage/appimagetool/releases/download/1.9.1/appimagetool-aarch64.AppImage"
+    APPIMAGETOOL_CACHE="${APPIMAGETOOL_CACHE}-1.9.1"
 fi
 
+# Architecture-specific caches never reuse an executable from a different CPU.
+
 # Clean and create work directory
 rm -rf "$WORK_DIR"
 mkdir -p "$APP_DIR"
@@ -57,7 +60,7 @@ if [ -s "$APPIMAGETOOL_CACHE" ]; then
 fi
 if [ ! -s "$WORK_DIR/appimagetool" ]; then
     echo "📥 Downloading appimagetool..."
-    wget --tries=3 --timeout=60 "https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage" -O "$WORK_DIR/appimagetool" || true
+    wget --tries=3 --timeout=60 "$APPIMAGETOOL_URL" -O "$WORK_DIR/appimagetool" || true
     if [ ! -s "$WORK_DIR/appimagetool" ]; then
         echo "❌ Failed to download appimagetool" >&2
         exit 1
@@ -67,6 +70,17 @@ if [ ! -s "$WORK_DIR/appimagetool" ]; then
     cp -f "$WORK_DIR/appimagetool" "$APPIMAGETOOL_CACHE"
 fi
 
+APPIMAGETOOL_ARGS=()
+if [ "$PMX_APPIMAGE_ARCH" = aarch64 ]; then
+    echo "f0837e7448a0c1e4e650a93bb3e85802546e60654ef287576f46c71c126a9158  $WORK_DIR/appimagetool" | sha256sum -c -
+    # Without --runtime-file, appimagetool 1.9.1 embeds the unpinned
+    # `continuous` runtime. Use a released runtime checked by its digest.
+    RUNTIME_URL="https://github.com/AppImage/type2-runtime/releases/download/20251108/runtime-aarch64"
+    wget --tries=3 --timeout=60 "$RUNTIME_URL" -O "$WORK_DIR/runtime-aarch64"
+    echo "00cbdfcf917cc6c0ff6d3347d59e0ca1f7f45a6df1a428a0d6d8a78664d87444  $WORK_DIR/runtime-aarch64" | sha256sum -c -
+    APPIMAGETOOL_ARGS=(--runtime-file "$WORK_DIR/runtime-aarch64")
+fi
+
 # Create directory structure
 mkdir -p "$APP_DIR/usr/bin"
 mkdir -p "$APP_DIR/usr/lib/python3/dist-packages"
@@ -245,6 +259,7 @@ fi
 # hb_ensure_borg used to download on demand — kept in lockstep so both
 # code paths see the same version semantics. SHA256 is the upstream
 # release checksum; bump both together.
+if [ "$PMX_APPIMAGE_ARCH" = x86_64 ]; then
 BORG_VERSION="1.2.8"
 BORG_URL="https://github.com/borgbackup/borg/releases/download/${BORG_VERSION}/borg-linux64"
 BORG_SHA256="cfa50fb704a93d3a4fa258120966345fddb394f960dca7c47fcb774d0172f40b"
@@ -280,6 +295,12 @@ else
     exit 1
 fi
 
+else
+    echo "⚠️  No official Borg 1.2.8 ARM64 standalone binary; using native-host adapter"
+    cp "$SCRIPT_DIR/borg_native_arm.sh" "$APP_DIR/usr/bin/borg"
+    chmod +x "$APP_DIR/usr/bin/borg"
+fi
+
 # Copy Next.js build
 echo "📋 Copying web dashboard..."
 if [ -d "$APPIMAGE_ROOT/out" ]; then
@@ -310,6 +331,7 @@ fi
 echo "📋 Copying AppRun script..."
 if [ -f "$SCRIPT_DIR/AppRun" ]; then
     cp "$SCRIPT_DIR/AppRun" "$APP_DIR/AppRun"
+    cp "$SCRIPT_DIR/appimage_arch.sh" "$APP_DIR/usr/bin/appimage_arch.sh"
     chmod +x "$APP_DIR/AppRun"
     echo "✅ AppRun script copied successfully"
 else
@@ -379,7 +401,7 @@ pip3 install --target "$APP_DIR/usr/lib/python3/dist-packages" --upgrade \
 # Phase 3b: Install the complete gevent/WSS runtime separately for every
 # supported host ABI.  Keeping each dependency tree isolated avoids mixing
 # CPython-specific modules from the build runner with those loaded by PVE.
-# The two --platform values allow gevent's manylinux_2_28 wheels and the
+# The three --platform values allow gevent's manylinux_2_28 wheels and the
 # backwards-compatible manylinux2014 zope.interface wheels to be resolved in
 # one deterministic installation.
 install_gevent_runtime() {
@@ -394,9 +416,9 @@ install_gevent_runtime() {
         --target "$target" \
         --upgrade \
         --only-binary=:all: \
-        --platform manylinux_2_28_x86_64 \
-        --platform manylinux_2_27_x86_64 \
-        --platform manylinux2014_x86_64 \
+        --platform "manylinux_2_28_${PMX_APPIMAGE_ARCH}" \
+        --platform "manylinux_2_27_${PMX_APPIMAGE_ARCH}" \
+        --platform "manylinux2014_${PMX_APPIMAGE_ARCH}" \
         --implementation cp \
         --python-version "$python_version" \
         --abi "$abi" \
@@ -547,7 +569,7 @@ if [ -d "$APP_DIR/bin" ]; then
 fi
 
 echo "🔍 Sanity check (ldd + presence of libfreeipmi)"
-export LD_LIBRARY_PATH="$APP_DIR/lib:$APP_DIR/lib/x86_64-linux-gnu:$APP_DIR/usr/lib:$APP_DIR/usr/lib/x86_64-linux-gnu"
+export LD_LIBRARY_PATH="$APP_DIR/lib:$APP_DIR/lib/${PMX_APPIMAGE_TRIPLET}:$APP_DIR/usr/lib:$APP_DIR/usr/lib/${PMX_APPIMAGE_TRIPLET}"
 
 if ! find "$APP_DIR/usr/lib" "$APP_DIR/lib" -maxdepth 3 -name 'libfreeipmi.so.17*' | grep -q .; then
   echo "❌ libfreeipmi.so.17 not found inside AppDir (ipmitool will fail)"
@@ -608,7 +630,7 @@ echo "🔨 Building unified AppImage v${VERSION}..."
 cd "$WORK_DIR"
 export NO_CLEANUP=1
 export APPIMAGE_EXTRACT_AND_RUN=1
-ARCH=x86_64 ./appimagetool --no-appstream --verbose "$APP_DIR" "$APPIMAGE_NAME"
+ARCH="$PMX_APPIMAGE_ARCH" ./appimagetool --no-appstream --verbose "${APPIMAGETOOL_ARGS[@]}" "$APP_DIR" "$APPIMAGE_NAME"
 
 # Move to dist directory
 mv "$APPIMAGE_NAME" "$DIST_DIR/"
diff --git a/docs/monitor-native-builds.md b/docs/monitor-native-builds.md
new file mode 100644
index 00000000..b578bcc2
--- /dev/null
+++ b/docs/monitor-native-builds.md
@@ -0,0 +1,37 @@
+# Native Monitor AppImage builds
+
+The builder selects its native architecture using `uname -m`. Supported targets
+are x86_64 and aarch64 (ARM64). It selects matching appimagetool executables,
+separate download caches, manylinux wheels and GNU library paths. Cross-building
+by overriding a target variable is intentionally unsupported: APT packages and
+other native Python dependencies must also match the build machine.
+
+Run `bash AppImage/scripts/build_appimage.sh` on a Linux builder with Node.js,
+Python/pip, APT and the usual AppImage build dependencies. AMD64 keeps the existing
+`ProxMenux-VERSION.AppImage` name; ARM64 produces
+`ProxMenux-VERSION-aarch64.AppImage`.
+
+The native validation workflow builds both architectures on GitHub's native
+Ubuntu 22.04 runners, extracts each AppImage without FUSE, and imports its bundled
+CPython 3.11 and 3.13 WebSocket/image runtimes, including the extracted launcher
+with only its final server execution intercepted. It does not upload artifacts,
+change release assets, or modify an installed Monitor.
+
+This build lane is a prerequisite for ARM distribution, not a declaration of
+PXVIRT or Raspberry Pi hardware compatibility. ARM release/checksum publication,
+installer selection and validation on the maintainer's PXVIRT lab remain separate
+steps before ARM installations can use a published image. The current release
+and installer distribution remain unchanged.
+
+## Borg host backups on ARM64
+
+Borg 1.2.8 publishes an AMD64 standalone executable but no ARM64 equivalent.
+ARM64 builds therefore include a small adapter that uses `/usr/bin/borg` from
+the host's native `borgbackup` package. Without that package it exits with a
+clear error; it never runs the AMD64 binary. The host-backup helper likewise
+refuses AMD64 cached/downloaded binaries on non-AMD64 hosts. The existing AMD64
+standalone binary and checksum remain unchanged. Operators must install their
+native distro package separately; this build does not install it on the host.
+
+ARM64 uses the official versioned appimagetool 1.9.1 with SHA256 verification;
+the existing AMD64 packaging tool remains unchanged.
diff --git a/lang/de.json b/lang/de.json
index 4af4b676..5de23f68 100644
--- a/lang/de.json
+++ b/lang/de.json
@@ -4398,6 +4398,7 @@
   "Name or part of the option or of the application": "Name oder Teil der Option oder der Anwendung",
   "Name:": "Name:",
   "Named accounts need private mode. Stop the container, set public: false in /config/config.js, start it again and create each user with: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge add <user>": "Benannte Konten benötigen einen privaten Modus. Stoppen Sie den Container, setzen Sie public: false in /config/config.js, starten Sie ihn erneut und erstellen Sie jeden Benutzer mit: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge add <user>",
+  "Native Borg is unavailable. Install the native borgbackup package on this host to use Borg backups.": "Natives Borg ist nicht verfügbar. Installieren Sie das native Paket borgbackup auf diesem Host, um Borg-Backups zu verwenden.",
   "Needed:": "Erforderlich:",
   "Needs": "Benötigt",
   "Neither /etc/kernel/cmdline nor /etc/default/grub found.": "Weder /etc/kernel/cmdline noch /etc/default/grub gefunden.",
diff --git a/lang/es.json b/lang/es.json
index 9d052db2..5948fc98 100644
--- a/lang/es.json
+++ b/lang/es.json
@@ -4393,6 +4393,7 @@
   "Name or part of the option or of the application": "Nombre o parte de la opción o de la aplicación",
   "Name:": "Nombre:",
   "Named accounts need private mode. Stop the container, set public: false in /config/config.js, start it again and create each user with: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge add <user>": "Las cuentas con nombre necesitan el modo privado. Detén el contenedor, pon public: false en /config/config.js, vuelve a arrancarlo y crea cada usuario con: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge add <user>",
+  "Native Borg is unavailable. Install the native borgbackup package on this host to use Borg backups.": "Borg nativo no está disponible. Instala el paquete borgbackup nativo en este host para usar los backups de Borg.",
   "Needed:": "Necesario:",
   "Needs": "Necesita",
   "Neither /etc/kernel/cmdline nor /etc/default/grub found.": "No se encontraron /etc/kernel/cmdline ni /etc/default/grub.",
diff --git a/lang/fr.json b/lang/fr.json
index 5a4bf47e..4f2e47ad 100644
--- a/lang/fr.json
+++ b/lang/fr.json
@@ -4398,6 +4398,7 @@
   "Name or part of the option or of the application": "Nom ou partie de l'option ou de l'application",
   "Name:": "Nom:",
   "Named accounts need private mode. Stop the container, set public: false in /config/config.js, start it again and create each user with: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge add <user>": "Les comptes nommés nécessitent un mode privé. Arrêter le conteneur, définir public: false in /config/config.js, recommencer et créer chaque utilisateur avec: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge ajouter <user>",
+  "Native Borg is unavailable. Install the native borgbackup package on this host to use Borg backups.": "La version native de Borg n’est pas disponible. Installez le paquet natif borgbackup sur cet hôte pour utiliser les sauvegardes Borg.",
   "Needed:": "Nécessaire :",
   "Needs": "Nécessite",
   "Neither /etc/kernel/cmdline nor /etc/default/grub found.": "Ni /etc/kernel/cmdline ni /etc/default/grub n'ont été trouvés.",
diff --git a/lang/it.json b/lang/it.json
index 3d3811ad..7e831a0a 100644
--- a/lang/it.json
+++ b/lang/it.json
@@ -4398,6 +4398,7 @@
   "Name or part of the option or of the application": "Nome dell'opzione o dell'applicazione, anche parziale",
   "Name:": "Nome:",
   "Named accounts need private mode. Stop the container, set public: false in /config/config.js, start it again and create each user with: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge add <user>": "Gli account nominativi richiedono la modalità privata. Arresta il container, imposta public: false in /config/config.js, riavvialo e crea ogni utente con: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge add <user>",
+  "Native Borg is unavailable. Install the native borgbackup package on this host to use Borg backups.": "La versione nativa di Borg non è disponibile. Installa il pacchetto borgbackup nativo su questo host per utilizzare i backup Borg.",
   "Needed:": "Spazio richiesto:",
   "Needs": "Richiede",
   "Neither /etc/kernel/cmdline nor /etc/default/grub found.": "Non sono stati trovati né /etc/kernel/cmdline né /etc/default/grub.",
diff --git a/lang/pt.json b/lang/pt.json
index f7a05c14..56c4130a 100644
--- a/lang/pt.json
+++ b/lang/pt.json
@@ -4398,6 +4398,7 @@
   "Name or part of the option or of the application": "Nome ou parte da opção ou do aplicativo",
   "Name:": "Nome:",
   "Named accounts need private mode. Stop the container, set public: false in /config/config.js, start it again and create each user with: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge add <user>": "Contas nomeadas precisam de modo privado. Pare o contêiner, defina público: false in /config/config.js, inicie-o novamente e crie cada usuário com: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge add <user>",
+  "Native Borg is unavailable. Install the native borgbackup package on this host to use Borg backups.": "A versão nativa do Borg não está disponível. Instale o pacote borgbackup nativo neste host para utilizar as cópias de segurança do Borg.",
   "Needed:": "Necessário:",
   "Needs": "Requer",
   "Neither /etc/kernel/cmdline nor /etc/default/grub found.": "Nem /etc/kernel/cmdline nem /etc/default/grub foram encontrados.",
diff --git a/lang/sk.json b/lang/sk.json
index 6235032e..ba1208a9 100644
--- a/lang/sk.json
+++ b/lang/sk.json
@@ -4398,6 +4398,7 @@
   "Name or part of the option or of the application": "Názov alebo časť možnosti alebo aplikácie",
   "Name:": "Názov:",
   "Named accounts need private mode. Stop the container, set public: false in /config/config.js, start it again and create each user with: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge add <user>": "Používateľské účty vyžadujú súkromný režim. Zastavte kontajner, v /config/config.js nastavte public: false, znova ho spustite a každého používateľa vytvorte príkazom: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge add <user>",
+  "Native Borg is unavailable. Install the native borgbackup package on this host to use Borg backups.": "Natívna verzia Borg nie je dostupná. Ak chcete používať zálohy Borg, nainštalujte na tento hostiteľ natívny balík borgbackup.",
   "Needed:": "Potrebné:",
   "Needs": "Vyžaduje",
   "Neither /etc/kernel/cmdline nor /etc/default/grub found.": "Nenašiel sa /etc/kernel/cmdline ani /etc/default/grub.",
diff --git a/lang/sv.json b/lang/sv.json
index d4345ae9..9e6f9555 100644
--- a/lang/sv.json
+++ b/lang/sv.json
@@ -4398,6 +4398,7 @@
   "Name or part of the option or of the application": "Namn eller del av alternativet eller applikationen",
   "Name:": "Namn:",
   "Named accounts need private mode. Stop the container, set public: false in /config/config.js, start it again and create each user with: pct exec <CTID> -- env THELOUNGE_HOME=/config s6-setuidgid abc thelounge add <user>": "Namngivna konton behöver privat läge. Stoppa behållaren, ställ in offentligt: falskt i /config/config.js, starta den igen och skapa varje användare med: pct exec <CTID> - env THELOUNGE_HOME=/config s6-setuidgid abc thelounge addera <user>",
+  "Native Borg is unavailable. Install the native borgbackup package on this host to use Borg backups.": "En inbyggd version av Borg är inte tillgänglig. Installera paketet borgbackup för värdens arkitektur för att använda Borg-säkerhetskopior.",
   "Needed:": "Behövs:",
   "Needs": "Kräver",
   "Neither /etc/kernel/cmdline nor /etc/default/grub found.": "Varken /etc/kernel/cmdline eller /etc/default/grub hittades.",
diff --git a/scripts/backup_restore/lib_host_backup_common.sh b/scripts/backup_restore/lib_host_backup_common.sh
index 1c465b19..b7938053 100755
--- a/scripts/backup_restore/lib_host_backup_common.sh
+++ b/scripts/backup_restore/lib_host_backup_common.sh
@@ -2021,6 +2021,13 @@ hb_ensure_borg() {
     #                                                without the new AppImage)
     command -v borg >/dev/null 2>&1 && { echo "borg"; return 0; }
 
+    # Cached/bundled/downloaded borg-linux64 below is AMD64 only. A native
+    # distro Borg may be used above, but never try a foreign cached executable.
+    if [[ "$(uname -m)" != x86_64 ]]; then
+        msg_error "$(hb_translate "Native Borg is unavailable. Install the native borgbackup package on this host to use Borg backups.")"
+        return 1
+    fi
+
     local appimage_cache="$HB_STATE_DIR/borg"
     [[ -x "$appimage_cache" ]] && { echo "$appimage_cache"; return 0; }
 
diff --git a/tests/test_appimage_arch.py b/tests/test_appimage_arch.py
new file mode 100644
index 00000000..5fef1cf1
--- /dev/null
+++ b/tests/test_appimage_arch.py
@@ -0,0 +1,131 @@
+"""Exercise native architecture wiring without building or changing the host."""
+import importlib.util
+import struct
+import os
+from pathlib import Path
+import shutil
+import subprocess
+import tempfile
+import unittest
+
+ROOT = Path(__file__).resolve().parents[1]
+SCRIPTS = ROOT / 'AppImage/scripts'
+
+
+class AppImageArchitectureTests(unittest.TestCase):
+    def configure(self, machine):
+        return subprocess.run(['bash', '-c',
+            'source "$1"; pmx_appimage_arch "$2" || exit; '
+            'printf "%s|%s|%s" "$PMX_APPIMAGE_ARCH" "$PMX_APPIMAGE_TRIPLET" "$PMX_APPIMAGE_SUFFIX"',
+            'fixture', str(SCRIPTS / 'appimage_arch.sh'), machine], capture_output=True, text=True)
+
+    def test_elf_audit_rejects_foreign_binary_without_executing_it(self):
+        spec = importlib.util.spec_from_file_location('appimage_elf_check', ROOT / '.github/scripts/check_appimage_elf.py')
+        module = importlib.util.module_from_spec(spec)
+        spec.loader.exec_module(module)
+        with tempfile.TemporaryDirectory() as folder:
+            binary = Path(folder) / 'fixture-elf'
+            header = bytearray(20)
+            header[:6] = b'\x7fELF\x02\x01'
+            header[18:20] = struct.pack('<H', 183)
+            binary.write_bytes(header)
+            self.assertEqual(module.check(folder, 'aarch64'), 1)
+            with self.assertRaisesRegex(ValueError, 'Foreign ELF machine 183'):
+                module.check(folder, 'x86_64')
+            binary.write_text('#!/bin/sh\nexit 127\n')
+            with self.assertRaisesRegex(ValueError, 'No native ELF files'):
+                module.check(folder, 'aarch64')
+
+    def test_supported_native_architectures_and_aliases(self):
+        for machine in ['x86_64', 'amd64']:
+            self.assertEqual(self.configure(machine).stdout, 'x86_64|x86_64-linux-gnu|')
+        for machine in ['aarch64', 'arm64']:
+            self.assertEqual(self.configure(machine).stdout, 'aarch64|aarch64-linux-gnu|-aarch64')
+
+    def test_unsupported_architecture_fails_before_build_side_effects(self):
+        with tempfile.TemporaryDirectory() as folder:
+            binary = Path(folder) / 'uname'
+            binary.write_text('#!/bin/sh\necho loongarch64\n')
+            binary.chmod(0o755)
+            result = subprocess.run(['bash', str(SCRIPTS / 'build_appimage.sh')],
+                env={**os.environ, 'PATH': folder + ':' + os.environ['PATH']}, capture_output=True, text=True)
+        self.assertNotEqual(result.returncode, 0)
+        self.assertIn('Unsupported Monitor AppImage architecture: loongarch64', result.stderr)
+        self.assertNotIn('Building ProxMenux', result.stdout)
+
+    def test_gevent_wheel_installer_uses_native_platform_for_both_abis(self):
+        source = (SCRIPTS / 'build_appimage.sh').read_text()
+        function = source[source.index('install_gevent_runtime() {'):source.index('\ninstall_gevent_runtime "3.11"')]
+        for machine in ['x86_64', 'aarch64']:
+            with tempfile.TemporaryDirectory() as folder:
+                command = ('source "$1"; pmx_appimage_arch "$2"; APP_DIR="$3"; '
+                           'python3() { printf "%s\\n" "$*"; }; ' + function +
+                           '\ninstall_gevent_runtime 3.11 cp311\ninstall_gevent_runtime 3.13 cp313')
+                result = subprocess.run(['bash', '-c', command, 'fixture', str(SCRIPTS / 'appimage_arch.sh'), machine, folder],
+                                        capture_output=True, text=True, check=True)
+            for platform in ['manylinux_2_28_', 'manylinux_2_27_', 'manylinux2014_']:
+                self.assertEqual(result.stdout.count('--platform ' + platform + machine), 2)
+            for abi in ['cp311', 'cp313']:
+                self.assertIn('--abi ' + abi, result.stdout)
+
+    def test_apprun_uses_native_library_paths_and_matching_host_python_tree(self):
+        for machine in ['x86_64', 'aarch64']:
+            with tempfile.TemporaryDirectory() as folder:
+                app = Path(folder)
+                (app / 'usr/bin').mkdir(parents=True)
+                (app / 'usr/lib/python3/vendor/cp311').mkdir(parents=True)
+                shutil.copy(SCRIPTS / 'appimage_arch.sh', app / 'usr/bin')
+                shutil.copy(SCRIPTS / 'AppRun', app / 'AppRun')
+                for name, body in {
+                    'uname': 'echo ' + machine,
+                    'readlink': 'printf "%s\\n" "$2"',
+                    'python3': 'if [ "$1" = -c ]; then echo cp311; else printf "LIB=%s\\nPY=%s\\n" "$LD_LIBRARY_PATH" "$PYTHONPATH"; fi',
+                }.items():
+                    file = app / 'usr/bin' / name
+                    file.write_text('#!/bin/sh\n' + body + '\n')
+                    file.chmod(0o755)
+                result = subprocess.run(['bash', str(app / 'AppRun'), '--translate'],
+                    env={**os.environ, 'PATH': str(app / 'usr/bin') + ':' + os.environ['PATH']},
+                    capture_output=True, text=True, check=True)
+                self.assertIn(str(app / ('usr/lib/' + machine + '-linux-gnu')), result.stdout)
+                self.assertIn(str(app / 'usr/lib/python3/vendor/cp311'), result.stdout)
+
+
+    def test_arm_borg_adapter_reports_unavailable_or_uses_native_host_package(self):
+        source = (SCRIPTS / 'borg_native_arm.sh').read_text()
+        with tempfile.TemporaryDirectory() as folder:
+            native = Path(folder) / 'borg'
+            adapter = Path(folder) / 'adapter'
+            adapter.write_text(source.replace('/usr/bin/borg', str(native)))
+            missing = subprocess.run(['sh', str(adapter), '--version'], capture_output=True, text=True)
+            self.assertEqual(missing.returncode, 127)
+            self.assertIn('Install the native borgbackup package', missing.stderr)
+            native.write_text('#!/bin/sh\nprintf "native %s|%s|%s|%s" "$*" "${PYTHONPATH-unset}" "${PYTHONHOME-unset}" "${LD_LIBRARY_PATH-unset}"\n')
+            native.chmod(0o755)
+            installed = subprocess.run(['sh', str(adapter), 'list', 'fixture-repo'],
+                env={**os.environ, 'PYTHONPATH': '/fixture/appimage/python', 'PYTHONHOME': '/fixture/appimage/home',
+                     'LD_LIBRARY_PATH': '/fixture/appimage/lib'}, capture_output=True, text=True, check=True)
+            self.assertEqual(installed.stdout, 'native list fixture-repo|unset|unset|unset')
+
+    def test_arm_host_backup_never_selects_cached_amd64_borg_or_downloads_it(self):
+        source = (ROOT / 'scripts/backup_restore/lib_host_backup_common.sh').read_text()
+        function = source[source.index('hb_ensure_borg() {'):source.index('\nhb_borg_init_if_needed()')]
+        with tempfile.TemporaryDirectory() as folder:
+            cached = Path(folder) / 'borg'
+            cached.write_text('#!/bin/sh\nexit 0\n')
+            cached.chmod(0o755)
+            script = (function + '\n'
+                'command() { if [ "$*" = "-v borg" ]; then return 1; fi; builtin command "$@"; }; '
+                'uname() { echo aarch64; }; hb_translate() { printf "%s" "$1"; }; '
+                'msg_error() { printf "%s" "$1" >&2; }; '
+                'wget() { echo UNEXPECTED_DOWNLOAD >&2; return 99; }; '
+                'HB_STATE_DIR="$1"; hb_ensure_borg')
+            result = subprocess.run(['bash', '-c', script, 'fixture', folder], capture_output=True, text=True)
+        self.assertEqual(result.returncode, 1)
+        self.assertIn('Native Borg is unavailable.', result.stderr)
+        self.assertNotIn('UNEXPECTED_DOWNLOAD', result.stderr)
+        self.assertEqual(result.stdout, '')
+
+
+if __name__ == '__main__':
+    unittest.main()