A healthcare company is designing a disaster recovery strategy for a critical application. The application uses EC2 instances and an RDS SQL Server database. The business requires an RPO of 15 minutes and an RTO of 4 hours. The solution must be as cost-effective as possible. Which DR strategy should the architect choose?

Answer options:

Backup and Restore: Take hourly RDS snapshots and EC2 AMIs. Copy them to the DR region.

Pilot Light: Replicate the RDS database to the DR region. Keep EC2 instances stopped or use Auto Scaling with capacity 0.

Warm Standby: Run a scaled-down version of the application in the DR region.

Multi-Site Active-Active: Run full capacity in both regions.

How to approach this question

Balance the RTO of 4 hours (allows time to spin up compute) with the need for cost-effectiveness.

Full Answer

B.Pilot Light: Replicate the RDS database to the DR region. Keep EC2 instances stopped or use Auto Scaling with capacity 0.✓ Correct

Pilot Light

Pilot Light maintains a live database replica (ensuring low RPO) but keeps compute resources scaled to zero or stopped. When disaster strikes, compute is provisioned, easily meeting a 4-hour RTO while minimizing ongoing costs.

Common mistakes

Choosing Warm Standby, which is less cost-effective.

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