Disaster Recovery

Implement disaster recovery strategies and procedures.

DR Metrics

recovery_metrics: RTO: Recovery Time Objective - Maximum acceptable downtime - How long to restore service

RPO: Recovery Point Objective - Maximum acceptable data loss - How much data can be lost

DR Strategies

Strategy RTO RPO Cost

Backup & Restore Hours Hours $

Pilot Light Minutes-Hours Minutes $$

Warm Standby Minutes Seconds $$$

Multi-Site Active Near-zero Near-zero $$$$

AWS Multi-Region

Cross-region RDS replica

aws rds create-db-instance-read-replica
--db-instance-identifier dr-replica
--source-db-instance-identifier prod-db
--source-region us-east-1
--region us-west-2

S3 cross-region replication

aws s3api put-bucket-replication
--bucket source-bucket
--replication-configuration file://replication.json

DR Testing

dr_test_schedule: tabletop: Quarterly component_failover: Monthly full_failover: Annually

test_checklist:

• Verify backup integrity
• Test failover procedures
• Validate data consistency
• Measure actual RTO/RPO
• Document lessons learned

Best Practices

• Regular DR testing

• Automate failover where possible

• Document all procedures

• Update runbooks after tests