Missing backup alert

Introduction

Cloud-PBS can automatically alert you when a datastore has received no successful backup for a duration you define. It’s a useful safety net: a backup job that stops running (broken schedule, host powered off, expired token…) no longer goes unnoticed.

Unlike Proxmox Backup Server’s verification, which checks the cryptographic integrity of existing backups, this alert watches for the absence of a new backup.

Enabling the alert

The alert is configured independently for each datastore.

1. Open your datastore in the dashboard.
2. Go to the Notifications tab.
3. Enable Missing backup (off by default).
4. Set the threshold: a number, then the unit hours or days (for example 12 hours, or 7 days).

That’s it — the alert is active as soon as you save.

How it works

Cloud-PBS regularly checks the date of the last successful backup (status OK) for each monitored datastore. If that date is older than the configured threshold, an alert is raised.

• Only a successful backup resets the clock. A backup that ended in error does not count, since it doesn’t protect your data.
• A freshly created datastore that has never received a backup yet is measured from its creation date, so it isn’t flagged immediately.

Notification channels

When the alert triggers, you’re notified via:

• Email to the datastore’s configured notification address;
• Webhook (if you’ve set one up);
• Notification center in the dashboard.

The affected datastore is also outlined in orange in the datastore list, with a “Missing backup” badge, for immediate spotting.

Frequency

While the condition persists, the alert is re-sent at most once every 24 hours to avoid spam. As soon as a new successful backup is recorded, the alert clears automatically and the datastore returns to its normal display.