Is using a NAS with hot swap disks an effective way of cycling backups?

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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. There are a number of options that we could potentially utilise. I like the idea of a NAS server, with a 2TB drive. The size will allow future growth, without spending a huge amount. I'd like to get a se (HowTos)