Yes I know!
Not necessary but it happened. First time i used calibre i tried to put a few hundred books in the library. I ended up with unknown author and unkonw title. So I decided to start another library but I messed up. Long story short, how can I manage various books at once. I backed up some of my libraries (yes, i've 6) and lost the metadata. anyway i can recuperate it? by the way, sorry that i misused this fine software.
