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ERROR_CLUSTER_BACKUP_IN_PROGRESS
ERROR_CLUSTER_BACKUP_IN_PROGRESS means a backup currently holds the cluster operation that was requested. This is usually expected coordination with VSS or backup software rather than a cluster fault.
Identify the backup job and the cluster object it is protecting before retrying the blocked operation. If the backup does not finish normally, investigate the VSS or backup workflow rather than forcing concurrent cluster changes.
What to check
- Identify the active backup job and wait for the active backup to finish or fail cleanly.
- Check the backup application and VSS-related events if the operation remains blocked beyond the expected window.
- Schedule disruptive cluster maintenance outside backup windows.
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