AWS Certified Solutions Architect - Professional

Use Amazon S3 Cross-Region Replication to replicate application container images from ECR in the primary region to ECR repositories in backup regions. Configure Route 53 weighted routing with health checks. During disasters, manually update DNS weights to shift traffic and scale up ECS tasks in the backup region.

Configure AWS Global Accelerator with multiple endpoint groups pointing to ALBs in all three regions. Use Global Accelerator's automatic health checks and traffic dial feature to shift traffic instantly during failures. Deploy ECS tasks on-demand in backup regions using AWS Systems Manager Automation runbooks triggered by CloudWatch alarms.

Deploy ECS Fargate tasks and ALBs in all three regions in active-passive configuration. Use Amazon Route 53 health checks with failover routing to redirect traffic to healthy regions. Implement AWS Backup to replicate ECS task definitions and ALB configurations to backup regions every 5 minutes.

Implement AWS CloudFormation StackSets to maintain identical ECS and ALB infrastructure across all regions. Deploy ECS tasks in all regions with minimum capacity. Use Amazon Route 53 Application Recovery Controller with health checks to manage traffic failover and route readiness checks to verify regional readiness before failover.