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Why not use Calibre for that?
Create a new database/library. Add a new record. Put isbn:978xxxxxxxxxx and download the data. You can customize your metadata source. You can customize what gets downloaded. You can than rate the book. You can tag it. You can write your own private review.
Given there are no books, only metadata, the folder is going to be quite easy to back up and very small. And because it is a separate library, it won't mess with other things you already have.
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