The backup of a powered-off VM within a Proxmox environment where High Availability (HA) is enabled but the HA status is Stopped, fails with the error:
Failed to perform backup: Failed to connect the NBD server to the hypervisor host.
To resolve this issue and allow the job to complete for powered-off VMs, reconfigure the Veeam Plugin for Proxmox to lock VMs during backup, informing the CRM not to trigger a stop operation.
C:\Program Files\Veeam\Plugins\PVE\Service\appsettings.json
"LockVmOnBackup": false
and change it to true
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