Please indulge this question from a technomoron lol. So I'm running BIAB through the external UltraPAK HD (not enough space on my "C" drive to install it)

I've only begun to create stuff with it, but here's my question: where do you save and store your music when using it? Is there a goodly amount of space on the UltraPAK to accumulate songs/compositions, or is there a proper method when saving so as to place your work back on your "C" drive, in the Windows "Music" folder for instance?