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You'll have much better help in the calibre forum (a bit lower down the main forum page) but the gist of it is :
- Calibre stores your metadata (data about the data) in its database and only writes it to files when you actually 'write' files (by copying your library, converting books, ...). And then only for file formats that accept metadata (epub, which you probably use, DOES).
What you can do :
a) Once in a while, do a disc write (or disc save? my calibre is in french) of your library to some other "backup" folder on the drive.
b) Use the 'Modify epub' plugin (preference->get new extension modules) to "update metadata" on the files you just finished filling out with interesting data.
..there are probably other ways I just don't remember right now. The Calibre sub-forum, as I said above, will be full of helping soulds.
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