I have 2 reasons for not keeping the originals of books. I back up my Calibre library on a regular basis. With the backup, I don't worry about loosing anything. As well, my originals are all over the place, so as I load books into Calibre, I'm deleting the original, thus cleaning up my system as I go. Doing this also lets me know what books I havn't loaded the book into Calibre. If it's still on my system outside of the Calibre library, then I haven't loaded the file. I don't worry about the file formats, because I know Calibre can handle the conversion to epub when I need it.
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