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After calibre transfers a book, the extra space taken up by Marvin would be for that book (plus a tiny fraction of it for the metadata and cover). I've done a test similar to the one GRiker did and noticed exactly the same - Marvin isn't taking up that space.
Also, IIRC, data used by an app is shown under the "Apps" section of the bar not under "Other". It must be something else.
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