What does HRESULT 0x80042315 (VSS_E_UNEXPECTED_WRITER_ERROR) mean?

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VSS could not communicate with a writer. Identify the failing writer in the event logs.

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VSS_E_HOLD_WRITES_TIMEOUT	VSS_E_SNAPSHOT_SET_IN_PROGRESS

VSS_E_UNEXPECTED_WRITER_ERROR

VSS_E_UNEXPECTED_WRITER_ERROR means that VSS encountered a problem while sending events to writers. Writers are application components that prepare data for a consistent backup and resume normal I/O after the snapshot.

How to investigate

Run vssadmin list writers and identify writers reporting a failed or unstable state.
Check Application and System events for the writer name, writer class ID, and the underlying application error.
Repair or restart the affected application component according to its vendor guidance, then retry the backup.

Microsoft: writers in the VSS backup workflow

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