Originally Posted by jerryleejr
I guess I can delete them I am just ending up with multiple files all over the place because I have went conversion crazy, I have taken all my Non DRM books and just for fun have been converting them for all the Readers!
Well, you can delete all those files. Calibre stores everything in a single database file. (SQlite db I think). So, delete all your files, then use calibre's save to disk feature to archive them all to your file system and for importing to other software viewers if needed.