If you use dot mac, get Backup 3 from mac.com and fill up that new gb of iDisk!
One nice thing is the easy to add backup of your itunes purchased music to DVD or CDs monthly. I’m doing a backup to DVD-RW right now and it even asked to erase the DVD-RW. This will be a nice monthly reminder.
I’m not sure how to keep the daily incremental backups from filling my iDisk – There are no preferences I can find!