I once had a back up system on a windows machine in my business and it slowed performance terribly. But it sounds as though this is not an issue with time machine. I'm considering purchasing a Time Capsule and converting the conglomeration of routers I have in my home now to a new network and back up system. My hope is that I will be able to configure a simple network myself and avoid spending money on a tech guy. I'll have one windows machine wired, two MBA machines wireless but also occasionally connected via a wired network connection via a thunderbolt display. Also two printer/scanners on the network, one network ready and one usb. Think I can handle the set up with the Time Capsule?