http://serverfault.com – We are looking at improving our backup solution. We don't have a huge amount of data to back up (currently ~500GB) which is backed up nightly onto an external HD. We have 3 of these HD, with one going in the firesafe on a weekly basis, and the other 2 rotating each night, so that the latest backup goes offsite overnight. The external HD are reaching capacity though, hence looking to upgrade. (HowTos)