I disagree, because I do not want everything in my library on my reader - it just gets in the way. I only want my to-be-read books on my reader. Now if the sync functionality works based on that sort of classification then it might be useful, but not in general.
besides you can use Beyond Compare (or other diff programs) if you are trying to sync directories up. I use it to keep my main ebook and calibre directories backed up.
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