I have a mac mini and a TC/AE. The mini is a late 2012 model and the TC is 3 yrs old (I think). Somewhere along the way I'm running into problems with the backups. It keeps giving me an error that "Cannot backup because the TC is in use." No idea how to resolve this. This is the only computer/network that uses this backup. Even if someone tried to use it, they would need my password, right? Thanks for any help.