I just bought a TC off eBay. I plan to plug this into my Xfinity Router which already has awesome wifi. I will create the Airport wifi network using the utility. To use TM to wirelessly back up (yes I will plug it in via ethernet for the first one), to I need my MBP to be on the Airport/TC wifi network? I would assume so, but since it is connected to my router maybe not? EDIT - sorry for the subject typo. Wish you could edit that.