A backup job can succeed every night while the actual recovery process remains untested. A small restore drill gives you a better answer to the question that matters during an outage. Can you get the service back?

Restore one guest somewhere safe

Pick a low-risk VM and restore it under a spare guest ID. Keep its network disconnected or isolated for the first boot so it cannot compete with the live VM for the same IP address or start a duplicate scheduled job.

Confirm that the guest boots, sign in, and open the application. Check a piece of data you expected to recover. For a database-backed app, that could be a record created shortly before the backup.

Write down how long the exercise took and what you had to retrieve separately, such as a password or an external mount. Those details turn a backup archive into a usable recovery plan. Proxmox VE Administration Guide