Note that, when I send my books to kobo using Calibre, Calibre will convert them before sending them to kobo, the converted .kepub.epub will not take more disk space once this progress finished(like I said they will be deleted).
And I note that you convert your files manually and keep both formats of files. It is really unnecessary and they will take more disk space, and for over 3000 books, that is a lot and you will spend a lot of time just for one conversion.
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