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I've just compressed my database, and it went from 486 to 462 Mb.
I have some 5000 books on the Libra, mostly kepubs. There are only 21 PDFs, those who can be read comfortably on 7", the rest of the PDFs are on the Forma.
From what davidfor writes, the nature of the books is responsible: I have as much of my reference library as I can on the readers, complete works with one entry per chapter or per poem, which makes for huge TOCs.
All the books have more or less detailed metadata, and a number are heavily annotated.
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