The following error message is seen when a file is in use and therefore being handled by VSS.
Warning: 21:47:05 Failed to read security descriptor for file: C:\Program Files\Computers\
Diagnostics\ServiceHost_20100620192402.xml, reason: \\?\GLOBALROOT\Device\
ServiceHost_20100620192402.xml (Access is denied)
This error occurs when the Redstor service does not have permission to access the original file and is therefore attempting to access the snapshot copy.
To resolve this, ensure that Redstor has read access to all files that you wish to back up. You will need to grant Redstor service administrator permissions, as described in Article 1432.