Nighly (or more frequently, if you like) rsync to an OpenSolaris server running ZFS w/ Time Slider.

Quality versioned backups with little effort, plus data integrity (checksums built into the filesystem), compression, and (if desired) RAID-Z(2) goodness! In addition, the provided time slider interface allows easy browsing of versions.

Just my 2c...

Of course, you could spend the ten seconds to google the guy.. Let's see.... MIT media lab; Worked at MIT since '86, now at Harvard... "8 years experience architecting and administrating large networks of Unix workstations." I think he can use the label if he wants to. :)