Well, I don't really understand your question.. Are you looking for hardware or software advice? Hardware - DVD-R (cheap per disk) or DVD-Ram (reasonable and since the disks are in little caddies they're a bit more secure).. Ummm.. Oh yeah, 400 gbs is a lot- I get annoyed swapping dvd's when backing up 40 gbs.. I haven't kept track of the tape drive market but that's another option.. I wish CastleWood was around - their orb drives were great (though they weren't very reliable)..