There may come a time when you need to perform a full synchronization of FRS data. The steps below outline both an authoritative and non-authoritative synchronization.
Non-Authoritative mode Restore - Downloads a fresh copy of the FRS data
1. Stop the File Replication Service Service
2. Edit the following registry key and set the BurFlags value to D2
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NtFrs\Parameters\Backup/Restore/Process at Startup
3. Restart the File Replication Service Service
4. Open event viewer and check the File Replication Service source you should see a 13565 Event logged to signal that a non-authoritative restore has started. When the process has completed a 13516 event is logged to signal FRS is operational.
Authoritative mode Restore - Downloads a fresh copy of the FRS data
1. Stop the File Replication Service Service on all downstream partners.
2. On the authoritative node edit the following registry key and set the BurFlags value to D4
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NtFrs\Parameters\Backup/Restore/Process at Startup
3. Restart the File Replication Service Service
4. Open event viewer and check the File Replication Service source you should see a 13566 Event logged to signal that a authoritative restore has started. When the process has completed a 13516 event is logged to signal FRS is operational.
Reference:
http://support.microsoft.com/kb/290762