I already have a router for the house. I want to have a Time Capsule for wireless backup, and still use the old router for the network (i am sharing the house so i can't replace the router). I have two questions. 1. Can I use Time Capsule without plugging the ethernet port? The router is in the basement, and I want to put the Time Capsule upstairs in my room. In other words, if I just plug in the power cord, can I use Time Capsule for wireless backup? Is it able to detect the wireless network and my MacBook? 2. My router would be 802.11g, is it gonna be very slow even the capsule is 802.11n? Thanks!