Mostly, these files are locked by the BITS (Background Intelligent Transfer Service) service and cannot be copied
by the programs.
It seems that the backup program cannot copy the files, either. BITS is a component of the Microsoft Software Update Services ( MSUS).
This service has been updated and included with SPs.
Generally, we can just skip them when this issue occurs.
If you cannot backup files due to these two files, you may
disable BITS service by running services.msc and then re-enable the service after backing up files.
or even better you can use the pre\post option on the client agent admin and use a batch file to stop this service prior to backup and start it after the backup.
Lyon