rsync + remote server (Score 2, Informative)

I'm dealing with pretty much the same issue right now as you. I've set aside a dedicated backup server (cheap K6/2 400) with a lot of disk space which uses rsync to backup the other servers in the office. Then I'm using rsync on an offsite server to keep a backup of the backup. Seems to work well. Having some sort of a raid setup on this box would be even more insurance I suppose.

I'm not using tape because the office I'm doing this for doesn't have a dedicated IT staff, and I'm not going there nightly/weekly to rotate tapes.