I load mine on my computer's hard drive. The folder that contains BIAB is 140 G (the UltraPak). It takes an hour (or 2) for it all to load, but that is just once. If you update to new versions, they load right over the existing stuff.

2 advantages to that, I think. Regeneration of tracks is a bit faster. And, once you load it to the computer hard drive, you can disconnect the drive it ships on - so it will never get corrupted and you always have a backup. If you have the space, why not...

(the company keeps your purchases available in your account, so you can always re-download them from there. So a local backup is not totally necessary. But, still, I like having it).