Looking forward to the delta-backups! Hope that feature comes out of beta soon.
An additional feature request:
Backup profiles, rather than one backup scheme. i.e. "Daily", "Weekly", "Monthly", "Custom" - with all settings for each. (See BackupBuddy, for example.)
For example, I would like to backup my database and config files daily, but my uploads perhaps only weekly or monthly. Or, I might want to have one delta-backup that updates daily, but do a separate DB/config backup Daily, and a full backup Monthly.