CauseVolume Shadow Service (VSS) Shadow Copy Optimization Writer' is not functioning correctly. In the event log above the issue involves resolving a SID.
The issue was that the SID being referenced in the event could not be resolved. This was due to a “.bak” entry inside the following registry sub tree.
The Shadow Copy Optimization Writer deletes certain files from volume shadow copies. This is done to minimize the impact of Copy-on-Write I/O during regular I/O on these files on the shadow-copied volume. The files that are deleted are typically temporary files or files that do not contain user or system state.
- Open regedit and locate 'HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ WindowsNT\CurrentVersion\ProfileList'
- Under the ProfileList subkey, delete any subkey that is named SID.bak.
Note :- SID is a placeholder for the security identifier (SID) of the user account that is experiencing the problem. The SID.bak subkey should contain a ProfileImagePath registry entry that points to the original profile folder of the user account that is experiencing the problem.