I tried to do some research on my own but I find it quite confusing. I wanted to buy an airport time capsule to keep my files all backed up at all times. Apparently, this thing can also act as a router...? I already have an internet modem that also acts as a router. So would this function be completely irrelevant? Can someone highlight some of the key features a time capsule can do? I have an imac, a macbook pro and an ipad, and I am wondering if time capsule can act as an external storage device where i can access files freely from all my devices?