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I do not think that message relates to backing up the database. I think it just means that after adding the book, the metadata.opf file has been created for that book (although I guess I could be wrong). Adding books is always a slow(ish) process as Calibre copies each file into its library as well as setting up entries in the metadata.db database. If you are reading metadata from the file it also has to open each file to extract its metadata.
One way that can speed up adding books (particularily for PDF files) is to disable reading the metadata from the file. However this may not be desireable as it means you later have to look at each book if you want to get its metadata set up.
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