I’m stunned that you are unfamiliar with the versioning feature of backups. In my bubble this has been best practice since Apple came along with the Time Machine, but really we tried that even before with rsync, albeit only with limited success.

This is different from git because this takes care about all files and configurations, and it does so automatically. Furthermore it also includes rules when to thin out and discard old versions, because space remains an issue.

Git is not a backup tool. It’s a versioning tool, best user for text files.