About half a MB per A4 side, according to a practical system described here: https://www.extremetech.com/extreme/134427-a-paper-based-backup-solution-not-as-stu

About half a MB per A4 side, according to a practical system described here: https://www.extremetech.com/extreme/134427-a-paper-based-backup-solution-not-as-stupid-as-it-sounds https://www.extremetech.com/extreme/134427-a-paper-based-bac... The 3.43MB@600dpi value does not include any redundancy and margin that a practical system needs. Now let's build a block storage system that uses A4 paper as blocks :) Given the ubiquity of paper sheets, there should good sheet manipulation and archival systems around right ?