Before any upgrade, a full backup of your Opigno instance (database and files) should be done, so that you can revert to the previous version in case the upgrade doesn't go well.
If you want to quickly check if your Opigno instance is up-to-date, you can simply click in the user menu on "About". You will see your version of Opigno as well as a green pictogram if it's up-to-date:
