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 is correct because it maintains a minimal core infrastructure (e.g., database, networking) in the secondary Region that can be quickly scaled up during a disaster, meeting the recovery time objective (RTO) of a few hours while keeping ongoing costs lower than a fully active second Region. It avoids rebuilding everything from scratch by having critical data and configurations already in place, allowing compute resources to be launched on demand.
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
This is the lowest-cost option, but recovery usually requires rebuilding much of the environment after a disaster.
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 running in the secondary Region, which lowers cost while reducing recovery time.
- ✓
Warm standby
Why this is correct
Warm standby keeps a scaled-down but functional environment ready, which shortens recovery while avoiding full active-active cost.
- ✗
Multi-site active-active
Why it's wrong here
Active-active improves availability, but it runs production in multiple Regions continuously and costs more than the stated goal.
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 design is not a regional disaster recovery strategy and does not meet the recovery objective.
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 running in the secondary Region, which lowers cost while reducing recovery time.
✗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
This SAA-C03 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAA-C03 exam.