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Backing up a Windows volume gives this error in the event log and the backup fails:
Volume Shadow Copy Service error: Error calling a routine on a Shadow Copy Provider {GUID}. Routine details BeginPrepareSnapshot({GUID(s)},\\?\Volume{GUID}\) [hr = 0x800700aa, The requested resource is in use
The event ID is 12293 and the source is VSS.
VSS (Volume Shadow Services) is used by Windows to allow access to files and folders for backup purposes while they are in use, so it’s a little strange to error calling a backup routine on a Shadow Copy Provider because the requested resource is in use 😕
Still, to fix the Volume Shadow Copy Service error, check that there’s enough space for the backup or if there’s enough space, just reboot the computer you are backing up then run the backup again.
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If you don’t want to reboot the computer, you can use the “vssadmin list writers” command in the command prompt to get information about the failed VSS writer, so you can restart the associated service.
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