Delete backup files

I there any setup or config option for keeping only the last system backup file in the backup directory? Because I have a very small disk quota. Or can I do it only manually? Sorry for stupid question. :)

There's no such option at the moment. You need to manually delete backups via FTP or shell, or (better) store them locally once the backup is created.

Thanks for the answer flaviocopes. :) Unfortunately it's a cheap shared hosting so I do not have a shell access. But I solved the problem with a cron job. This job runs once a day, finds the .zip files in the backup folder and delete them.