Why not just use backups to backup your library. That's what backups were invented for.
If you have thousands of documents and you care at all about them, you had better be backing them up. Backing up the metadata.db file in addition is a tiny step. And if you backup regularly you will lose only a finite amount of metadata, not the metadata of all your thousands of books.
I believe in using the proper tool for the job. Guaranteeing data safety is the job of backups. There is no way that a program that has write access to any file can ever guarantee data safety.
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