HRESULT 0x80042316 (VSS_E_SNAPSHOT_SET_IN

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Another VSS snapshot set is active. Wait for it to finish before retrying.

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VSS_E_UNEXPECTED_WRITER_ERROR	VSS_E_MAXIMUM_NUMBER_OF_SNAPSHOTS_REACHED

VSS_E_SNAPSHOT_SET_IN_PROGRESS

VSS_E_SNAPSHOT_SET_IN_PROGRESS means that VSS is serializing shadow-copy creation and another requester has an active snapshot-set workflow. Starting a second set at that point is not supported.

What to do

Wait for the active VSS operation to complete or fail, then retry the request.
Coordinate backup schedules so multiple requesters do not start snapshot creation concurrently.
On clustered or scale-out storage, verify that several nodes are not adding the same CSV volume or share at the same time.

Microsoft: serialized VSS state transitions

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