A company is designing a disaster recovery plan for a critical application. The application uses Amazon EC2, Amazon RDS for PostgreSQL, and Amazon S3. The RPO is 1 hour and the RTO is 2 hours. They have chosen a 'Warm Standby' strategy in a secondary AWS Region. Which THREE actions should be part of this strategy? (Select THREE)

Answer options:

Configure Amazon RDS Cross-Region Read Replicas.

Enable S3 Cross-Region Replication (CRR) for the application buckets.

Maintain a scaled-down Auto Scaling group of EC2 instances in the secondary region.

Use AWS Backup to take daily snapshots of RDS and copy them to the secondary region.

Deploy an identical, full-scale Auto Scaling group in the secondary region.

Use AWS CloudFormation to provision the EC2 instances only after a disaster is declared.

How to approach this question

Match the 'Warm Standby' concept (scaled-down compute) and the strict RPO (continuous replication for DB and S3).

Full Answer

Configure Amazon RDS Cross-Region Read Replicas. Enable S3 Cross-Region Replication (CRR) for the application buckets. Maintain a scaled-down Auto Scaling group of EC2 instances in the secondary region.

Warm Standby means a scaled-down version of a fully functional environment is always running in the DR region. To meet the 1-hour RPO, continuous replication is needed (RDS Read Replicas and S3 CRR). During a disaster, the scaled-down ASG is simply scaled up to handle production traffic.

Common mistakes

Choosing daily backups, which violates the 1-hour RPO requirement.

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