To protect your notes from unexpected issues, it's always a good idea to make regular backups of your library. The backup will also provide a quick way to transfer your library to a new GoodNotes installation on another device.
Settings
> Back up Data
> Back up Now
.Save to Files
from the Share sheet and choose a safe place for the .zip file.<aside> ⚠️ Please keep the app visible in the foreground until the backup finishes, or you might need to restart the process.
</aside>
Other ways to back up data: