Turned off the "Backup Main Database Every Night" to stop back up of a server but it is still backing up the event database.
Security Expert Server
Even though the "Backup Main Database Every Night" option is turned off, the "Event Database"->"Generate Differential Events Backup" is running ever night.
Log on to the Security Expert System then go to Global->General-> under the events tab. Uncheck/remove the "Generate Differential Events Backup" option along with "Backup Main Database Every Night". The event's backup will stop.