[bin] Add utm backup script

bin/.bin/utm-backup.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# ---- CONFIG ----
+UTM_DIR="$HOME/Library/Containers/com.utmapp.UTM/Data/Documents"
+VM_NAME="Personal Fedora.utm"
+
+REMOTE_HOST="rhea.local"
+REMOTE_DIR="/tank/backups/utm"
+
+KEEP=5
+DATE="$(date +%Y-%m-%d_%H-%M-%S)"
+
+BASENAME="${VM_NAME%.utm}_$DATE"
+ARCHIVE="/tmp/$BASENAME.tar.gz"
+
+# ---- SANITY CHECKS ----
+if [[ ! -d "$UTM_DIR/$VM_NAME" ]]; then
+  echo "ERROR: VM not found: $UTM_DIR/$VM_NAME"
+  exit 1
+fi
+
+# Optional: refuse if VM might be running
+if pgrep -f "$VM_NAME" >/dev/null; then
+  echo "ERROR: VM appears to be running. Shut it down first."
+  exit 1
+fi
+
+# ---- CREATE ARCHIVE ----
+echo "Creating compressed archive..."
+tar -C "$UTM_DIR" -czf "$ARCHIVE" "$VM_NAME"
+
+# ---- COPY ----
+echo "Uploading $ARCHIVE → $REMOTE_HOST:$REMOTE_DIR/"
+scp "$ARCHIVE" "$REMOTE_HOST:$REMOTE_DIR/"
+
+# ---- REMOTE ROTATION ----
+echo "Pruning old backups on remote (keeping last $KEEP)..."
+
+ssh "$REMOTE_HOST" "
+  ls -dt $REMOTE_DIR/${VM_NAME%.utm}_*.tar.gz 2>/dev/null \
+  | tail -n +$((KEEP + 1)) \
+  | xargs -r rm -f
+"
+
+# ---- CLEANUP ----
+rm -f "$ARCHIVE"
+
+echo "Backup complete."
+