I also use git to make backups of my org-mode files. I made a simple script in git bash for windows to commit changes to local repo and then push to a remote repo. I did this because I discovered that dropbox was no longer versioning my org files as I expected. Not sure why but I'm way more comfortable with a local and remote git repo. I run the script several times a day. There are libraries for emacs that can automate this process but I haven't bothered.