A step-by-step, game-day-tested DR checklist for AWS: dependency mapping, RTO/RPO targets, strategy selection, backup verification, control-plane drills, and the failover test most teams skip.
What Availability Zones actually protect you from, what only a second region can, and a cost/RTO decision framework - grounded in how real AWS outages (2017, 2021, 2025) actually failed.