I am looking an app for my Mac that can backup in the background (such as Backblaze or CrashPlan) that will backup over SFTP, rsync, or scp (I'm using DreamHost's 50GB of personal backups). Preferably this application would be free, but I would be willing to pay a bit of money.
UPDATE: It would be nice if it could encrypt the backups before sending them as well.