I installed this plugin today and was clicking around a bit trying to understand what it did. One of the things I clicked was Set Unread Collection. Result: almost all the books on my e-reader are now marked unread and I can't think of a way to get the old data back. Funnily enough if I open a book on my e-reader that I've read before it opens on the last read page, so that data is still there.
Now obviously this is a user error and I shouldn't have done it this way. But I think it's currently way to easy to destroy your unread flags without a way of getting them back. Maybe a big warning before you run this the first time is in order? And/or an automatic backup of the current settings so you can restore those?
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