Those aren't backups, if you check the server schedule - you will see that those are the messages generated when it saves the world and writes it to disk. This is not the same as a backup.
You need to either add a schedule entry to take them for you, make one by visiting the Backup tab, or using the /backupworld command in-game.
Please only download PhonicUK software from PhonicUK.com!
Edited 3/9/2011 1:50:02 PM by PhonicUK: grammar