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Backup or replication of a Windows OS fails. In the Windows event logs of the machine being backed up, there is an error with ID 8193 from source VSS: Volume Shadow Copy Service error: Unexpected error calling routine Cannot find anymore diff area candidates for volume \\?\Volume{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx}\ [0]. Note: This KB specifically addresses the error “cannot find anymore diff area candidates for volume.” There are a variety of possible VSS errors with ID 8193.
The Volume Shadow Copy Service is unable to allocate disk space to create a shadow copy because the maximum size of the shadow storage area is too small.
Note: If this error occurs on a Hyper-V host when backing up VMs on that host, see KB1846.
By default, each volume stores its own shadow copy. For example, a shadow copy of a CSV mapped to C:\ClusterStorage\Volume8 would also be stored on C:\ClusterStorage\Volume8. The location of the shadow storage area may be changed as described in KB1794.It is not necessary to enable shadow copies for shared folders. It is normal for “Next Run Time” to show “Disabled.”
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