Okay so here is my setups. I have 2 macs in my house.. a macbook pro and a macbook air. I have an old dell desktop running windows 7 that has a terabyte external harddrive hoooked up to it. I want to be able to use it as a network time machine drive. Both laptops are running snow leopard. I was wondering is this possible and if so, how can I do it. Currently I am able to see the desktop and the external hardrive on my network from the macs, and I am able to drag and drop onto them, however I want to be able to use time machine. Can someone please help me.