How about a Windows home server? For small businesses its a great tool to have for file share and unified access let alone automated backups. Mine has been a great help on many occasions (Hard drive failures and system upgrades), just pop in the recovery boot disk and have the server rebuild the hard drive from an existing backup.
Here is a 2tb HP unit for example:http://www.newegg.com/Product/Product.aspx?Item=N82E16859105568&cm_re=home_server-_-59-105-568-_-Product
Expandable (can add more hard drives latter down there road) and no extra software required.
Food for thought