Backup Strategies for OS X
I have been using an rsync script in cron—works fine but is a bit messy due to lack of support for binary and some meta-data in files.
Here are some answers:
http://www.macdevcenter.com/pub/a/mac/2004/02/10/backup.html
http://www.bombich.com/software/ccc.html
http://datasetgo.com/blog/?postid=19
http://rdiff-backup.stanford.edu/
http://www.rsnapshot.org/
http://www.shirt-pocket.com/SuperDuper/SuperDuperDescription.html