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VSS_E_OBJECT_ALREADY_EXISTS
VSS_E_OBJECT_ALREADY_EXISTS means that a VSS object with the requested identity already exists. Depending on the operation, that can be a duplicate provider registration, snapshot component, or other VSS-managed object.
How to investigate
- Enumerate existing objects before creating a new one and compare their identifiers.
- Use an update, reuse, or cleanup workflow if the operation is meant to be idempotent.
- Avoid deleting existing VSS data only to silence the error; confirm it is stale and not used by another backup job.
Microsoft: VSS requester operations
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