First, you do not have to back up your database just to upgrade to a newer YouTrack build or version — after you have upgraded, YouTrack will find your database automatically.
Hint: You can track availability of YouTrack new builds right from Administrators UI. Check the 'Update info' panel on the Administration > Settings page. If a new build is available, you will see a link to download the update.
To upgrade to a newer YouTrack build or version:
- Back up your database. (Highly recommended!)
- Stop YouTrack JAR, or YouTrack service (if you run YouTrack as Windows service).
- Replace your old youtrack.jar with a new build or version. Feel free to rename the new file to match the old one.
- Start YouTrack JAR or application server.