Do I just put the command line into Windows Command Prompt under Accessories? One more thing, someone told me that since firebird is based on SQL, it is OK to just use the Windows copy & paste function to back up the database. Of course I haven't try that. What I have tried is using Windows Backup under Accessories-System Tool-Backup to: 1. backup the database, then 2. move the original database to somewhere else, & then 3. restoring the database from backup file. IT DID WORK! Also when I deleted the restored backup file & moved back the previously moved original database file, it looks still OK. Any comment especially concerning database corruption issue?