I backup my home directory daily at work and at home with rdiff-backup (similar to rsnapshot, but... written in Python :) and I keep a 30 days incremental backup of everything. I rarely use it but it saved my life a couple of times...

BTW it needs absolutely zero work : cron takes care of the daily backup, and sends me an email when (very rarely) something wrong happens (it detected a corrupted filesystem a couple of times, and a bad disk block once), and that's it.