When you create, edit, or delete synchronization objects, the Mobile Devices Administration Center records this administration information in a control database stored on the Sync Server system. The name of this database is DSYCTLDB. DSYCTLDB is a reserved name; you cannot rename the database, or use the name DSYCTLDB for any other database in the system. This database should not be used to store additional tables or as a replication mirror or target.
Created at installation time, the control database helps the Sync Server authenticate users and obtain subscription information to determine what to replicate for the synchronization requests. Because it contains synchronization setup information as well as status information about synchronization operations, ensure that you regularly back up the Mobile Devices Administration Center control database.