added systemd services

templates/backup-check.j2

@@ -0,0 +1,14 @@
+#!/bin/bash
+set -euo pipefail
+
+{% if backup_backend == 'restic' %}
+# restic backend
+source /etc/backup-client/restic.env
+
+restic check --read-data
+
+{% endif %}
+
+{% if not backup_backend %}
+echo "Noop, backup is handled external"
+{% endif %}