As soon as I buy a book I put it into calilbre. And all my purchased books go in the Kobo. I don't put in the Kobo only some public domain books that I download and are in calibre but I likely won't read.
Now I buy almost all my books from Kobo and if the books is properly formatted (if it fit my preferences) I download it directly in the Kobo with wi fii, if the book need a restyling I put it in the archive in Kobo site and I change it and then it goes in the Kobo from calibre.
In the other ereaders I only put books I that I want to read with them.
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