If it is still in your dropbox account, go in there, make a copy of that database, then past it back into users\patrick\calibre library.
The thing that annoys me about using the dropbox app on the computer is if you drag a file into it it moves it from the original location into dropbox (or in this case users\documents\dropbox). I when I feel like uploading epubs that I have on my computer into dropbox, I usually just select the ones I want do a copy then paste it (not paste shortcut) into dropbox.
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