Tbf you did start your post with
I’m in the process of starting a proper backup
So you’re going to end up with at least a few people talking about how to onboard your existing backups into a proper backup solution (like borg). Your bullet points can certainly probably be organized into a shell script with sync, but why? A proper backup solution with a full backup history is going to be way more useful than dumping all your files into a directory and renaming in case something clobbers. I don’t see the point in doing anything other than tarring your old backups and using borg import-tar
(docs). It feels like you’re trying to go from one half-baked, odd backup solution to another, instead of just going with a full, complete solution.
I wouldn’t necessarily say this. RH’s still a major defense contractor, and IBM too.