And it still does not support my server.

Not yet.

No. Git is inefficient for small numbers of files. Just do a “find | wc” and/or a “du -hs” in your repository folder. SVN exists for a reason.

Git might be over engineered for this purpose. Maybe SVN?

I keep my server backups on a dedicated backup server.

I run OpenBSD and OmniOS.

Docker does not even work on my servers - wrong operating system, I guess. Docker containers have one more disadvantage on systems where it does work: the contents of a container aren’t updated when the host operating system is, basically leaving 0-days unpatched longer than absolutely necessary.

Also, using a container adds severe overhead.

IMO, Unison is a pretty good software for this use case.