Domain 3 glossary

Term	Meaning
Availability	Ability to serve when requested
Durability	Probability that data remains intact
RTO	Maximum acceptable recovery time
RPO	Maximum acceptable data-loss window
Pilot light	Core and data ready; compute restored during recovery
Warm standby	Scaled-down functional recovery environment
Active/active	Multiple Regions serve production
Blast radius	Scope affected by a failure
Game day	Planned failure exercise