SAA-C03 Design Resilient Architectures Practice Question
A customer portal must recover from a regional outage within a few hours. The business wants lower ongoing cost than a fully active second Region and does not want to rebuild everything from scratch during the outage. Which two DR patterns best fit that goal? Select two.
⚠ Common exam trap
AWS often tests the distinction between pilot light and warm standby—the trap here is that candidates may confuse pilot light with backup and restore, not realizing that pilot light maintains a live, minimal environment (e.g., database replicas) rather than just backup files, enabling faster recovery without full rebuild.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Pilot light
Pilot light (B) is correct because it keeps a minimal, always-on core (for example replicated data and pre-provisioned but scaled-down compute) in the DR Region, so recovery only requires scaling up and starting the remaining resources rather than rebuilding everything from scratch, and its low baseline footprint keeps ongoing cost well below a fully active second Region. Warm standby (C) is correct because it runs a scaled-down but fully functional copy of the workload in the second Region, allowing it to be scaled up to production capacity within hours while still costing less than a fully active second Region. Backup and restore (A) is not the best fit because recovery means redeploying and rebuilding the entire environment from backups, which typically exceeds a few hours and requires substantial manual effort. Multi-site active-active (D) is excluded because running full production capacity in two Regions simultaneously is the most expensive option and contradicts the goal of lower ongoing cost. Single-AZ deployment (E) is not a cross-Region DR pattern at all and provides no protection against a regional outage.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Backup and restore
Why it's wrong here
Backup and restore rebuilds infrastructure and reloads data from backups, so recovery takes far longer than the few hours required, and the environment must be recreated during the outage. It is tempting because it is the cheapest pattern, and it suits workloads with a recovery time of many hours or days where cost outweighs speed.
When this WOULD be correct
A question where the RTO is measured in days (e.g., 24-48 hours) and the business can tolerate rebuilding the entire environment from scratch using backups, with minimal ongoing cost as the primary driver.
- ✓
Pilot light
Why this is correct
Pilot light keeps only core components such as the database replication running in the second Region, so recovery within hours is achievable without rebuilding everything, while ongoing cost stays well below an active-active deployment. It matches the lower-cost, few-hours RTO constraint.
- ✓
Warm standby
Why this is correct
Warm standby runs a scaled-down but fully functional copy of the workload in the second Region, allowing rapid promotion to full capacity within hours. Ongoing cost remains lower than a fully active second Region, and no rebuild from scratch is needed.
- ✗
Multi-site active-active
Why it's wrong here
Multi-site active-active runs full production capacity in two Regions simultaneously, so its ongoing cost is not lower than a fully active second Region, which the business explicitly rejected. It is tempting because it delivers near-zero recovery time, making it correct when the requirement is minimal downtime and cost is secondary.
When this WOULD be correct
An application requires near-zero RTO and RPO with automatic failover, and the business has budget for continuous dual-region operation, such as a global e-commerce platform that cannot tolerate any downtime.
- ✗
Single-AZ deployment
Why it's wrong here
A single-AZ deployment places all resources in one Availability Zone, so an AZ failure or wider Regional outage leaves no standby capacity to recover into. It is tempting because it minimises cost for non-production or fault-tolerant workloads, but it provides no cross-Region recovery mechanism at all.
When this WOULD be correct
For a non-critical application with low cost priority and tolerance for downtime during an AZ failure, where the question specifies 'single Availability Zone' and does not mention regional outage recovery.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Pilot lightCorrect answer▾
Why this is correct
Pilot light keeps only core components such as the database replication running in the second Region, so recovery within hours is achievable without rebuilding everything, while ongoing cost stays well below an active-active deployment. It matches the lower-cost, few-hours RTO constraint.
✗Backup and restoreWrong answer — click to see why▾
Why this is wrong here
Backup and restore typically has a Recovery Time Objective (RTO) of hours to days, which may not meet the 'within a few hours' requirement, and it often involves rebuilding infrastructure from backups, which the question explicitly wants to avoid.
★ When this WOULD be the correct answer
A question where the RTO is measured in days (e.g., 24-48 hours) and the business can tolerate rebuilding the entire environment from scratch using backups, with minimal ongoing cost as the primary driver.
Why candidates choose this
Candidates may think backup and restore is the cheapest DR option and assume it can meet a 'few hours' RTO if backups are restored quickly, underestimating the time needed to provision infrastructure and validate the environment.
✗Multi-site active-activeWrong answer — click to see why▾
Why this is wrong here
Multi-site active-active requires fully active resources in two regions simultaneously, which incurs higher ongoing costs than a fully active second Region, contradicting the requirement for lower cost.
★ When this WOULD be the correct answer
An application requires near-zero RTO and RPO with automatic failover, and the business has budget for continuous dual-region operation, such as a global e-commerce platform that cannot tolerate any downtime.
Why candidates choose this
Candidates may assume that active-active provides the best recovery time and mistakenly think it can be cost-effective if traffic is balanced, overlooking the higher infrastructure and data replication costs.
✗Single-AZ deploymentWrong answer — click to see why▾
Why this is wrong here
Single-AZ deployment does not provide any cross-region recovery capability; a regional outage would cause complete downtime, contradicting the requirement to recover within hours.
★ When this WOULD be the correct answer
For a non-critical application with low cost priority and tolerance for downtime during an AZ failure, where the question specifies 'single Availability Zone' and does not mention regional outage recovery.
Why candidates choose this
Candidates may confuse high availability within a single region with disaster recovery across regions, or think that a single AZ is sufficient for 'low cost' without considering regional failure.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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