I'm doing this now on 6.0.1. I have modified the do_backup script to use rsync. It only backs up the files that have changed since the last backup. I have a 250GB HDD in a USB2 enclosure. The one problem I had is that I had to rate-limit rsync to 10 Megabytes/sec, as if I let it run at full speed it would sometimes corrupt the disk. This is a problem with the USB support in the kernel, I think. It is still a helluvalot faster that tape though.