rdiff-backup efficient mirroring/incremental backup

From time to time, the discussions on slashdot lead to some useful information… like this: rdiff-backup is a program that utilizes rsync’s rdiff code to do incremental backups. Using rdiff, it can save just the parts of files that have changed, making it possible to store incremental changes in a much smaller amount of space. It can run on Linux, Windows (via cygwin) and Mac OS X, so I’ll be able to back up all of the data we’ve got.