That wouldn't be bad actually. I'm almost through all of my blank BDs backing up other data, so I'd have enough space for the editing and I still want to backup the work data from v2.0 and v2.5 for possible later use. Right now this amounts to around 500-600GB, though if I go through it, I'm sure to discover a lot of duplicity and a lot of unnecessary files but at a guess, I'll need to back up at least 200GB and I'd prefer to back it up twice to make sure nothing is lost. So to do this I'm gonna need a hell of a lot of blank BDs. I can buy some of course but they're still pretty expensive, so some blanks would be a great help.