How to Turn an Old PC Into a Home File Server: "Do you have an old desktop PC sitting in a closet somewhere? Put it to use by installing FreeNAS. FreeNAS is a free, open-source operating system that will convert old PCs into network-attached storage devices.
Use your NAS as a central file storage or backup location for every PC on your network. FreeNAS also supports plug-ins, so you could even run a BitTorrent client or media server on it."
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