If you were looking for a way to back up digital data onto actual paper:
: This official CISA publication summarizes security considerations and best practices for critical data.
These are the industry standards used by IT professionals for planning:
: A comprehensive survey paper covering various backup methods, including full vs. incremental and on-line backup technologies like snapshots.
: This is a unique paper-based solution discussed by ExtremeTech that allows you to print bit-mapped data onto acid-free paper, which can last for 100+ years. It is most commonly used for backing up high-value, small-sized data like encryption keys . Summary of the "3-2-1 Rule" The 3-2-1 Backup Strategy of Data Protection - Backblaze