HRESULT 0x00042321 (VSS_S_SOME_SNAPSHOTS_NOT

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Description:

Only part of the VSS snapshot set was imported. Inspect each snapshot before using the set.

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VSS_S_ASYNC_CANCELLED	VDS_S_DISK_PARTIALLY_CLEANED

VSS_S_SOME_SNAPSHOTS_NOT_IMPORTED

VSS_S_SOME_SNAPSHOTS_NOT_IMPORTED is a partial-success status from importing a transportable shadow copy set. At least one shadow copy was imported, but one or more snapshots in the set were not.

How to investigate

Enumerate the imported snapshots and inspect their properties instead of assuming that the whole set is available.
Compare the source and destination storage configuration, provider availability, and transportable-snapshot requirements.
Check VSS and provider event logs for the snapshot IDs that failed to import.

Microsoft: VSS backup processing overview

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