How to get Snapshot Backup to stop saving backups to the server.

I've installed this tool and so far things seem to be great BUT!

I created a snapshot that would backup EVERYTHING including files, media etc, and I directed that to backup to my dropbox account. its all setup but it keep a copy on the server killing my server space and preventing any updates or changes to the site.

How do i make all backups only store on dropbox?