Please do backups regularly.
Here is how to backup and copy to another iPad with iFunBox
Here is how to backup and copy to another iPad with iMazing.
If you have an iPad Pro, it is also possible to Airdrop all of your files to a computer. Go to Settings->Utilities and choose Airdrop Documents to Computer. This will use Airdrop to send the entire Documents folder to a computer. This will be a complete backup of unrealBook files.
Before Catalina, the fastest and most reliable way is to use iTunes.https://diystompboxes.com/unrealbook/manual/how-to-make-a-manual-backup-of-unrealbook-files-with-itunes-12/
This method will backup only the unrealBook music files and works well.
The following methods require you to restore the entire iPad if you need to recover the backup:
Make a complete backup of your iPad via iTunes.https://diystompboxes.com/unrealbook/manual/how-to-make-a-manual-backup-of-unrealbook-files-with-itunes-12/
However, if you are running Catalina, this is no longer easy or possible to do.
Therefore, use iCloud backup: