There are no restore functions in the plugin because it should only be done with care.
The annotations files can be restored to the directory "Digital Editions/Annotations". This only contains annotations for epubs and PDF files. If you sideload kepubs, their annotations are only stored in the database.
The device database can be restored to replace the new database in the .kobo directory. After doing this, you should restart the device.
For either of these to work properly, the books have to be restored to the same place and file name they were when the backups were done. But, I don't normally recommend restoring the database after a factory reset. The database backups are more for recovery from a corrupted database. Restoring a recent good backup will usually solve this problem.
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