I too keep EPUB format for most books, the exception being some PDFs. The MOBI formats are converted on-the-fly from the EPUBs during the Send to device. After reading the books on Kindle I update the metadata in calibre Library View, remove the books from Kindle in calibre Device View, and remove the MOBI formats from calibre Library View, keeping only the EPUB master.
Last edited by unboggling; 10-01-2012 at 05:42 PM.
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