AWS Cloud Architecture•Part 5: Security, IAM, Messaging & Enterprise Deployments (51 - 65)
Disaster Recovery Strategies: Cost vs RTO/RPO.
In Simple Words: From lowest cost to highest resiliency:
- Backup & Restore: Data backed up to S3; restored on failure (RTO/RPO in hours).
- Pilot Light: Core data replicated continuously; minimal core compute kept off until disaster strikes.
- Warm Standby: Scaled-down version of full environment running continuously in a secondary region.
- Multi-Region Active-Active: Workloads served simultaneously from multiple regions (RTO/RPO near zero; highest cost).
bash
# S3 Cross-Region Replication (CRR) setup for DR:
aws s3api put-bucket-replication --bucket primary-data-bucket --replication-configuration file://replication-config.json