Next option is a PC, which adds at the minimum 200W of 24/7 power requirement, not exactly cheap given today's electricity prices. I've got just the hardware f

Next option is a PC, which adds at the minimum 200W of 24/7 power requirement, not exactly cheap given today's electricity prices. I've got just the hardware for you: http://www.tedunangst.com/flak/post/new-home-router http://www.tedunangst.com/flak/post/new-home-router https://www.newegg.com/Product/Product.aspx?Item=N82E16856205007 https://www.newegg.com/Product/Product.aspx?Item=N82E1685620... There are various other NUC type devices based on laptop chipsets (or you could just use an old laptop with hardware Ethernet and a large-enough hard drive... built-in battery backup!). The software maintenance is definitely an issue, but I don't see Windows Small Business Server being any better than Linux, there's still a lot of mysterious things that can happen.