added backup script

scripts/restic-backup.sh

@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ENV_FILE="${SCRIPT_DIR}/restic-backup.env"
+HOMELAB_ROOT="/srv/homelab"
+STACKS_STOPPED=false
+
+start_stacks() {
+  if [[ "$STACKS_STOPPED" != true ]]; then
+    return 0
+  fi
+  echo "Starting Docker stacks..."
+  cd "$HOMELAB_ROOT"
+  docker compose -f stacks/media/compose.yaml up -d
+  docker compose -f stacks/monitoring/compose.yaml up -d
+  docker compose -f stacks/storage/compose.yaml up -d
+  echo "Stacks started."
+}
+trap start_stacks EXIT
+
+if [[ -f "$ENV_FILE" ]]; then
+  set -a
+  # shellcheck source=/dev/null
+  source "$ENV_FILE"
+  set +a
+fi
+
+if [[ -z "${RESTIC_REPOSITORY:-}" ]]; then
+  echo "Error: RESTIC_REPOSITORY is not set. Create ${ENV_FILE} or export it." >&2
+  echo "Example: RESTIC_REPOSITORY=sftp:user@host:/backups/restic" >&2
+  exit 1
+fi
+
+if [[ -z "${RESTIC_PASSWORD:-}" ]]; then
+  echo "Error: RESTIC_PASSWORD is not set. Create ${ENV_FILE} or export it." >&2
+  exit 1
+fi
+
+CADDYFILE="/etc/caddy/Caddyfile"
+UNBOUND_CONF="/etc/unbound/unbound.conf"
+
+echo "Stopping Docker stacks..."
+cd "$HOMELAB_ROOT"
+docker compose -f stacks/media/compose.yaml down
+docker compose -f stacks/monitoring/compose.yaml down
+docker compose -f stacks/storage/compose.yaml down
+STACKS_STOPPED=true
+
+echo "Starting restic backup..."
+restic backup \
+  "$HOMELAB_ROOT" \
+  "$CADDYFILE" \
+  "$UNBOUND_CONF"
+
+echo "Backup finished. Snapshot list:"
+restic snapshots --latest 5