NAS devices are the all-in-one kitchen appliance, the jack of all trades of the home network. They can do one thing, they can do many things, and often you don't even need all of the features. While it's great to own a £350 top-of-the-line model, it doesn't mean it's the best solution to your needs. For a lot less money you can buy a versatile NAS that stores files, manages your back-ups and lets you share data over your own network and the internet.