The road to Ubuntu: Backup Hell

I've decided to see if Ubuntu can meet my needs, but recreating my backup regime under Gutsy Gibbon is proving quite a challenge. The people behind Handy Backup are working on a Linux version, but until it's available I'll have to come up with something else. I'm not prepared to start using Ubuntu for work until I get a satisfactory backup regime in place.

I've tried a few backup programs, but none seem to meet all my needs. The main problem is that I want to backup a folder stored on my FAT32 data drive to an external device (my data is on a FAT32 drive so I can boot into XP or Ubuntu and access my files). Some basic backup applications won't let me backup more than once a day, which just isn't often enough for my liking - a whole day's work is just too much to lose.