Backup metadata database
In the File menu choose Export... then YoYottaID Archive.
Choose a location to save the file.
Then if you need to restore it, quit YoYottaID, create a copy of the archive named YoMain.db and drop it into the folder shown below.
Moving metadata database to a new computer
Quit YoYottaID on the old computer.
Run YoYottaID once on the new computer and then quit.
Copy the YoMain.db file from the old computer to the new computer. Open the Finder to this location to see the database file. (Replacing the YoMain.db file that is already there)