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.

https://www.howtogeek.com/190835/how-to-turn-an-old-pc-into-a-home-file-server/

For some reason the first time I read the title I thought it said "How to turn an old PC into a home fire starter"

Hahaha

Ha ...
That might work too ...