now that i am building my network storage box, i have decided that ultimately the way i am going to run a backup routine is a couple of sets of hard drives that i will copy data to in an external enclosure, remove from the enclosure and store safely offsite and rotate as needed. after much research, i am convinced that this is the best mix of price, convenience and reliability so long as they are regularly rotated and re-written with current backup data. i have also been reading about including parity data on the backups to aid in restoration if some sectors go bad or other non-total catastrophes - not in terms of a RAID array, but extra data on each of my single disk backups. can anyone enlighten me on this a bit under OS X? specifically, any software you use to do this.