robertferanec

This plugin backups the content which you write on the Edit page. It will upload it to GitHub or it will download it from GitHub.
When you are writing a page/post and you would like to backup the text, you can use this plugin. If anything happen to your server, you always will have the texts on GitHub.
This plugin can also be used for collaboration. You can easily see and track any changes done by other people + you can comment the changes on GitHub.
With this plugin you can easily synchronize content of WordPress posts or pages between mutliple servers. For example, you (or someone else) can create/update posts and pages on your test server, then you can check the changes on Github and once you are happy with them, just go to your live server, press a button to download the the changes from GitHub and publish them on your live website.

Posts and Pages GitHub Backup

Backups WordPress content of your posts and pages to GitHub

rubengarzajr

GitSync adds a new option to the admin dashboard that allows you to add a Theme from Github. 
When properly configured, you can then pick a release to be downloaded to your instance of WordPress.
Just enter the URI of the repo and your personal token and then click Add Theme. 
You’ll then see the repo list below in the Installed Themes area.
Just choose a release and click on “Sync to the release.”

GitSync

Download and sync themes from github.com or private github using release tags.

Posts and Pages GitHub Backup vs GitSync