Actually in the past people really did re-use paper (and papyrus, vellum, slate etc) documents that way! They would scrape off or erase or whitewash what was o

Actually in the past people really did re-use paper (and papyrus, vellum, slate etc) documents that way! They would scrape off or erase or whitewash what was on there previously and write on top. People wouldn't create a new file if they could just reuse an existing one.