I use A D16 and for now until korg gets it together in July, I've got a ORB unit made by Castlewood which uses removable 2.2gig discs , IT seems to be the most cost effective so far at about 235.00 for the unit which comes with one disc, and each additional disc is 39.00 . although I'm actually copying the songs ,not backing them up . the only difference is you have to be careful about editing the user effects . I sure hope Korg comes through as I already purchased a yamaha CDR drive which will ultimatly be the best way , and the cheapest to back up . good luck to all us D16 owners !