What does HRESULT 0x800423FA (VSS_E_MISSING_VOLUME) mean?

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An expected volume did not arrive in the system. Check the Application event log for more information.

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VSS_E_MISSING_HIDDEN_VOLUME	VSS_E_AUTORECOVERY_FAILED

VSS_E_MISSING_VOLUME

VSS_E_MISSING_VOLUME A volume expected by the VSS operation did not arrive in the system. The backup or restore set cannot be considered complete until the missing volume is found and its identity is verified.

What to check

Check whether the volume is offline, not mounted, inaccessible through a storage path, or missing after a hardware or virtual-disk change.
Use the backup job and VSS events to identify the expected volume GUID rather than relying only on historic drive letters.
Resolve the underlying storage visibility problem before retrying import, restore, or revert.

mountvol

vssadmin list shadows

Microsoft: vssadmin list shadows

Microsoft: Volume Shadow Copy Service

Microsoft: VSS documentation portal

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