Proxmox qm set ID –lock backup failed: exit code 25

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Proxmox qm set ID –lock backup failed: exit code 25

#vm locked after failed backup, can't unlock

qm set $SYSTEM_ID$ --lock backup failed: exit code 25

Seems the VM is looked bay another "vzdump" already running? If not, simply unlock it:

 qm unlock $SYSTEM_ID$

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