I feel like you made it sound a bit backwards :)

There's nothing to install on a "git server", git doesn't have a server component. You can point your git client to a remote place where it can store its files using SSH. But you don't install anything on the server for this.

Which is why self hosting a git remote is super easy. All you need is a server with ssh and a little bit of storage.

If you just want to sync code between different computers and have a backup, that's all you need.