DR region: us-west-2 RPO (recovery point objective)
- Within region (AZ/instance failures): 15 minutes for Aurora and S3 configuration data
- Region loss: 24 hours via daily cross‑Region snapshot copy (Aurora) and S3 versioning
- AZ / instance failures: 30 minutes (Aurora failover + stateless services)
- Region recovery: 4 hours (restore in us‑west‑2 + redeploy)
In‑flight notification events during a region outage may be dropped. Clients should retry with idempotency.