Years ago I came across filecoin/sia decentralized data storage and I started trying them but then I stopped due to lack of time. Some days ago I’ve heard in a podcast about a kind of NAS that does kinda the same thing: it spreads chunks of data across other devices owned by other users.

Is there a service that does this but with your own hardware or, even better, something open source where you can have X GB as far as you share the same amount of space plus something extra?

It would be great for backup.