What is the most efficient method to set up a home server? - eviltoast

Hey guys, I’m new to self-hosting; I’m trying to set up cloud storage to store pics and other content. However, I’m unsure whether to use my old computer, Buy NAS or ResberryPie to set up a home server.

Also, what is the best privacy-friendly OS to use with the home server?

Lastly, do’s and don’ts.

Any help would be appreciated (: