What does HRESULT 0x800423F0 (VSS_E_WRITERERROR_INCONSISTENTSNAPSHOT) mean?

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VSS_E_WRITERERROR_INCONSISTENTSNAPSHOT the shadow-copy set only contains only a subset of the volumes needed to correctly backup the selected components.

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VSS_E_WRITERERROR_INCONSISTENTSNAPSHOT

VSS_E_WRITERERROR_INCONSISTENTSNAPSHOT The snapshot set does not contain every volume that the writer needs to back up its selected components consistently. This is often a backup-scope configuration error.

What to check

Use the writer metadata and backup application log to identify all volumes required by the affected application component.
Add the missing required volumes to the same snapshot set and rerun the job.
Do not treat a snapshot of only one visible drive letter as sufficient when an application stores data, logs, or dependencies on other volumes.

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