Ok, so I have a 4 TB Time Machine. To the point, it does not back up only my internal drive, but also two external drives. However, I have noticed something. The one external drive I unplug sometimes to use somewhere else. When I do this and go into time machine, that drive no longer appears in the history. Therefore, how would I ever retrieve things in Time Machine for one of these external drives, if they ever blew up completely and I couldn't reconnect them? The information is in Time Machine, but it seems to not give me access if the original drive is not connected too? How do you get around that? Thanks!!!!