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  • VSS Error - 8193 Unexpected error calling routine ConvertStringSidToSid
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You may see an error similar to the following in your Image or File and Folder backup VSS log


.This error is caused by a stale user profile registry entry that could not be resolved by the VSS Shadow Copy Optimization Writer.


  1. Open the MS Registry editor 'Regedit.exe'.
    Press the Windows key and type 'regedit'

     
  2. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList and delete any sub-keys that end in '.bak'
  3. Restart your PC 
     
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