When you use Group Policy Management Console (GPMC) to import a backed up GPO, it temporarily creates some directories: AdmOld MachineOld UserOld MachineStaging UserStaging https://support.microsoft.com/en-us/help/3146601/gpo-import-fails-and-rollback-results-in-the-target-policy-being-delet The sysvol-sync tool should skip them.
This issue has been filed against UCS 4.2. UCS 4.2 is out of maintenance and many UCS components have changed in later releases. Thus, this issue is now being closed. If this issue still occurs in newer UCS versions, please use "Clone this bug" or reopen it and update the UCS version. In this case please provide detailed information on how this issue is affecting you.