You could look into getting a NAS
There is a cheap Netgear 4disk NAS I was looking into getting. probably would be perfect for you.http://www.pccasegear.com/index.php?main_page=product_info&cPath=617&products_id=21901
you can plug a USB device into it and hit the backup button and it will backup everything on it, no messing about in windows, plus it can act as a print server.
this is in Australia so you'd probably want to find a more local store.