I have Apple TV and the Sonos music system throughout my house. The more I stream over my network (from Itunes) the more I worry. I am considering getting a NAS just for my music since the Sonos supports this. That way if my Apple TV is streaming a movie or syncing, I assume my music playing throughout my house won't be impacted, or at least as much. I would appreciate input on this theory as I am by no means a network expert. If what I proposed makes sense, how can I by music on Itunes, or Amazon, and have both my IMacs hard drive and the NAS get the new downloads. For example, if I buy a song on my Apple TV and it syncs to my Imac hard drive, how do it get it to my NAS. Can you point purchases to download copies to two drives? Sorry if this is a crazy question. Thanks.