PBS datastore issues after Proxmox host/cluster recovery (lab environment)

GenXSimmer

New Member
Jan 23, 2026
1
0
1
Hello,

I’m running Proxmox VE and Proxmox Backup Server in a non-enterprise lab environment and I’m looking for guidance on safely restoring or reinitializing my PBS setup after a host recovery.

Environment
  • Proxmox VE 8.x
  • Proxmox Backup Server running as a VM
  • No enterprise subscription (lab use only)
  • PBS datastore backed by a Synology NAS (NFS)
  • Previously part of a 2-node PVE cluster (now dismantled)
What happened
  • One PVE host experienced hardware and networking failures
  • Cluster quorum issues occurred and the cluster was ultimately dismantled
  • PVE hosts were reinstalled and VMs restored successfully
  • PBS VM still exists, but backup jobs and/or datastore access are no longer functioning correctly
  • Backup tasks appear stuck or inconsistent after the downtime
Current status
  • Most VMs are running and data is intact
  • PBS VM boots
  • Datastore exists but backups are not behaving normally
  • I want to avoid corrupting the datastore or orphaning snapshots
  • I would like to be able to restore some of the VMs from the PBS datastore that I am not currently able to add to my new PBS instance.
What I’m looking for
  • Recommended steps to:
    • Validate PBS datastore integrity
    • Determine whether datastore metadata should be repaired, reattached, or recreated
    • Safely resume backups from Proxmox VE
  • Guidance appropriate for a lab / non-enterprise setup
I’m happy to provide logs or command output if needed.

Thank you for your time and for maintaining Proxmox — it’s been invaluable for learning and lab use.

Best regards,
Tom