Ed, maybe we're not understanding each other. There is nothing in the DCS "base", the TIU, to be backed up. All data is in the remote, if you have a remote. So the computer gets hooked into the TIU, the computer program started, and then just follow the on-screen instructions and the data gets stored in the computer. What would a wifi do? If you are using wifi, the data is in your tablet/phone/whatever, so there is no need to back it onto a computer.
I have two wifi units on mt layout, left over from when I was beta testing the system. Never use them, preferring the remote as easier to operate 4-6 trains on intersecting routes.