I’ve heard that immich and other picture-organizing software can will something like this?

Also, Sonic Robo Blast 2 Kart

Maybe it’s because they were vibe-writing.

I don’t have my glasses on right now but just reading the title, sounds like you might want this

https://en.m.wikipedia.org/wiki/Wikipedia:Database_download

So, to be clear, GitHub is not git. Git is intrinsically distributed. GitHub is basically a repository Management service.

I did some googling for about 10 seconds and afaik GitHub does not support any type of self hosting. I know you can selfhost gitlab , but I don’t see a project for either GitHub or gitlab called spokes.

Not knowing anymore than this about what you actually want to accomplish, my advice would be to just figure out how to run your own git server (without the management fluff) and do a 3-2-1 backup scheme. You could of course also create a gitlab instance with an HA set-up, plus backing that up to the cloud.