My webMethods Server uses Derby, a file-based database, as its embedded database. If one database file gets corrupted, the entire database might become unusable. Software AG therefore recommends backing up the Software AG_directory \MWS\server\server_instance\data\db folder regularly so you will be able to return to the last known good state if necessary. If you do not take a backup, you can restore the database to an empty state from the Software AG_directory \MWS\server\template-derby.zip\data\db directory.