longhorn backup schedule

clusters/base/infra/longhorn/recurring-jobs/recurringjob-backup.yaml

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+apiVersion: longhorn.io/v1beta2
+kind: RecurringJob
+metadata:
+  name: backup
+  namespace: longhorn-system
+spec:
+  task: "backup"
+  cron: "0 3 * * *"
+  retain: 7
+  concurrency: 2
+  # "default" is a special group name: Longhorn auto-applies it to every
+  # volume that has NO recurring-job label at all - i.e. opt-out. To
+  # exclude a specific volume, give it any other (job-less) group label,
+  # e.g.:
+  #   recurring-job-group.longhorn.io/no-backup: enabled
+  # (having *any* recurring-job label disqualifies it from "default" -
+  # there's no dedicated "disabled" flag, this placeholder-group is the
+  # documented workaround)
+  groups:
+    - default
+  labels: {}