I would love and pay for this as well. I actually wanted to make this as a teenager but then it turns out I never finish projects. Probably also because restic or similar didn't exist yet so I started to write everything from scratch.
Some software existed, like duplicity with pgp, but it had major downsides that I had ideas about how to do better. I was pretty proud of the chunking algorithm that I had adapted from rsync, and I got really good performance by using python for the logic and C for the code that actually operated on the files, but that's also where the interest started to wane.
Restic with rest-server in append-only mode is a nice solution, but I'm not aware of anyone packaging this in a pre-configured image you can just flash. You'd also have to balance who backs up to whom. If that could somehow dynamically balance, that would absolutely be a dream.
Some software existed, like duplicity with pgp, but it had major downsides that I had ideas about how to do better. I was pretty proud of the chunking algorithm that I had adapted from rsync, and I got really good performance by using python for the logic and C for the code that actually operated on the files, but that's also where the interest started to wane.
Restic with rest-server in append-only mode is a nice solution, but I'm not aware of anyone packaging this in a pre-configured image you can just flash. You'd also have to balance who backs up to whom. If that could somehow dynamically balance, that would absolutely be a dream.