: A comprehensive survey paper covering various backup methods, including full vs. incremental and on-line backup technologies like snapshots.

: This USENIX research paper is a classic study comparing different strategies for large file systems.

: This official CISA publication summarizes security considerations and best practices for critical data.

If you were looking for a way to back up digital data onto actual paper:

For in-depth technical analysis or historical perspectives on backup strategies:

These are the industry standards used by IT professionals for planning: