Okay, I found an 8 TB MyBook... I think I'll get that, and use this "Personal Cloud" for my long-term storage.  I'll see if I can find it in a shop rather than send out for it, I'd like to not do that if I can avoid it.

I should also look into getting a USB 3.0 hub since I don't know how old/what standard my TARDIS hub is, and the wire is starting to fray.  It's probably time for an upgrade.