What is the key to astronaut safety? Fail-safes. Redundancy in operating systems means having either a second, duplicate system to your main system or a backup system that replicates the functionality of your main system. Redundancies are built into Orion’s systems at every possible level, from its wiring to solar panels to parachutes.
Source
Back-ups, Redundancies & Fail-safes: The Key to Astronaut Safety on Orion
