I am looking to get one of the new Airport Time Capsules to backup my computers. If I want to use it to backup but not connect it to any modem or internet is it still possible to backup wirelessly to it? I live in a house that I rent from the owner and they live upstairs and I do not have access to the modem for the wifi. I would also like to hook a printer up to it. Will this all work if there is not cord coming from a modem to the back of it? Appreciate the help.