Strip mediaserver hardware config for new server migration

Clear old disk UUIDs, boot config, and filesystem mounts.
Add backup script for migrating service state to new hardware.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backup-server.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+BACKUP_DIR="/mnt/disk4/server-backup-$(date +%Y%m%d)"
+echo "Backing up to: $BACKUP_DIR"
+mkdir -p "$BACKUP_DIR"
+
+# Stop services first to get clean copies
+echo "Stopping services..."
+sudo systemctl stop jellyfin sonarr radarr prowlarr bazarr qbittorrent-nox authelia-main 2>/dev/null || true
+sleep 3
+
+# Service databases and config
+for dir in jellyfin sonarr radarr prowlarr bazarr qbittorrent authelia-main; do
+  if [ -d "/var/lib/$dir" ]; then
+    echo "Backing up /var/lib/$dir ..."
+    sudo mkdir -p "$BACKUP_DIR/var-lib/$dir"
+    sudo rsync -a "/var/lib/$dir/" "$BACKUP_DIR/var-lib/$dir/"
+  else
+    echo "Skipping /var/lib/$dir (not found)"
+  fi
+done
+
+# Secrets
+if [ -d "/var/secrets" ]; then
+  echo "Backing up /var/secrets ..."
+  sudo mkdir -p "$BACKUP_DIR/var-secrets"
+  sudo rsync -a "/var/secrets/" "$BACKUP_DIR/var-secrets/"
+else
+  echo "Skipping /var/secrets (not found)"
+fi
+
+echo ""
+echo "Backup complete: $BACKUP_DIR"
+echo ""
+echo "Size: $(sudo du -sh "$BACKUP_DIR" | cut -f1)"
+echo ""
+echo "NOTE: Media files on /mnt/storage are NOT included — move the data disks to the new server directly."
+echo ""
+echo "Restarting services..."
+sudo systemctl start jellyfin sonarr radarr prowlarr bazarr qbittorrent-nox authelia-main 2>/dev/null || true