So, it is time to update your Ghost blog to the latest version? Here are the steps you need to take to do it the right way.
First, make a full backup
Whenever doing a manual update it’s a good idea to take a full backup of your site first. If anything goes wrong, you’ll still have all your data.
Start by exporting a JSON file backup of all your posts from the Labs area of Ghost Admin.
Then, make a copy of your entire
/content directory as a backup for themes and images.
# Duplicate the content directory cp -r content /backup/content
Run the Ghost update command
When you’re ready, make sure you’re in your site’s root directory and then run the Ghost update command using Ghost-CLI.
# Run the update ghost update
That's all. If you encounter any problems you can easily rollback to previous version.