In the Digital Era, Publication Isn’t Preservation | Digital Book World it’s not always readily obvious that the metadata is correct. But just
as important, the connection of metadata to digital book content is more
tenuous. Without a hard copy to refer back to, a piece of information
that goes missing may not be retrievable. For this reason (and more), the Internet Archive has been keeping physical copies of all the books it scans that would otherwise be discarded. And all books it can get its hands on.
