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FOSS software to make old PC into a NAS?
(kbin.social)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Proxmox
Edit: Installed as the hypervisor on bare metal and then whatever you want to try out like OMV, Plex, jellyfin, syncthing or cloud software in an LXC or VM
A hypervisor is a great option because it lets you test a bunch of different software solutions to see what works for you, and it's a great way to learn. Proxmox VE is just a great software too.
Turnkeys are super useful too