A much better alternative would be using a NAS, a network storage server. NAS often has a much smaller foot-print than a server. It often runs on a stripped down Linux OS that does not require much computer knowledge to set up. It is much cheaper than a full server and due to its design it is often much more energy efficient than a server. Most NASes often consume power less than 50W even under full load. Contrast this to a simple system with 70W of power consumption, the 20 extra watts of power consumption adds up when you leave the system running 24/7.