Principlev1
Test backup systems periodically under realistic conditions
Test backup systems periodically under realistic conditions to verify they can actually substitute for primary systems when needed.
Why This Is a Principle
Derives from Human memory under stress and cognitive load is unreliable (memory under stress is unreliable) and Hindsight Bias and Calibration Necessity (memory reconstructs beliefs). The principle prescribes testing behavior based on understanding that untested redundancy is theoretical and that memory of system capabilities is unreliable. It's highly actionable and general across all backup systems.