I know this has been talked about in other threads but there is a new backup feature with interworx in the upcoming release where you can backup your SiteWorx structure (all settings and email accounts etc.) but no data. This leaves you open to backup the data using rsync. This has 2 pluses in my book 1) instead of backing up all the files everytime you only backup changed files (and i think maybe just the bits in the file that changed?) and 2) the interworx backup compresses the backups into a tgz (which put a good load on a CPU).