diff --git a/hosts/monitoring-3/rules.yml b/hosts/monitoring-3/rules.yml
index 49ea8b5..06e74b8 100644
--- a/hosts/monitoring-3/rules.yml
+++ b/hosts/monitoring-3/rules.yml
@@ -25,6 +25,14 @@ groups:
     annotations:
       summary: "Storage of {{ $labels.instance }} is full"
       description: "Storage of {{ $labels.instance }} for {{ $labels.mountpoint }} on {{ $labels.device }} is full"
+  - alert: ClerieBackupJobLastSuccessfulRunBehind
+    expr: time() - clerie_backup_last_successful_run_time{} >= 5400
+    for: 5m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Last successful backup on {{ $labels.instance }} older than 1h"
+      description: "Backup job {{ $labels.backup_job }} to target {{ $labels.backup_instance }} finished successfully over an hour ago"
   - alert: InstanceJustBooted
     expr: time() - node_boot_time_seconds{job="node-exporter"} <= 300
     labels: