I am about to update my computer to leopard. I was wondering if it was possible with bootcamp to create a vista and/or xp machine which resides on an external hard drive only, to conserve my laptops hard drive as i wont be using windows much at all. Also, a time machine question. Is it possible to allocate a small amount of disc space to time machine, then plug in an external hard drive and dump the data to conserve disc space?