Thanks very much for the suggestions, all. I've only had time to try the plug-in, and that got rid of about 4 mb. I've been backing up books on Calibre and changing the occasional cover, but not really playing around with files otherwise. I'm on a Mac, so I'll see what I can find to look at the files.
At work I read on a tablet and on a dedicated ereader at home, so for me one issue is more syncing bookmarks than space. Speed isn't a factor yet; the reader hasn't been slow for reading, though syncing does take quite a while.
Last edited by tea2; 09-18-2013 at 01:18 PM.
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