It sounds like OP is already self-hosting and wants an external backup solution?

I’m also in that boat and use rsync.net. It’s been reliable enough and pretty cheap. Borgmatic runs a nightly job to sync to a local + remote repo

Hmm I transferred a lot of my stuff from GitHub to GitLab a while ago mainly because of the free private repos. Was thinking about moving fully off GitHub but glad I waited 🙃 Still going to do it but gotta figure out which providers actually have their heads somewhere other than up their ass