I believe it was some sort of hard copy back-up system. He called it a "book." He called it something else too. Something that also began with the letter B.
He said that it was a database of events and that most of these events had already occured. Most....I asked him if it was some sort of historical account. He replied that of what he could translate, was historical, but that the final, yet-to-be translated section, speaks about the future. Of things to come.