- A
Backup and restore
Why wrong: This is the lowest-cost option, but recovery usually requires rebuilding much of the environment after a disaster.
- B
Pilot light
Pilot light keeps only core components running in the secondary Region, which lowers cost while reducing recovery time.
- C
Warm standby
Warm standby keeps a scaled-down but functional environment ready, which shortens recovery while avoiding full active-active cost.
- D
Multi-site active-active
Why wrong: Active-active improves availability, but it runs production in multiple Regions continuously and costs more than the stated goal.
- E
Single-AZ deployment
Why wrong: A single-AZ design is not a regional disaster recovery strategy and does not meet the recovery objective.
Question 382 of 1,040
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: pilot light keeps core services running in the DR region.. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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, always-running core infrastructure (e.g., a small database and application server) in the secondary Region, replicating data continuously. During a regional outage, you can rapidly scale up the environment by provisioning additional resources (e.g., EC2 instances from pre-baked AMIs) to become fully active, meeting the recovery time objective (RTO) of a few hours while keeping ongoing costs lower than a fully active second Region.
Key principle: Pilot light keeps core services running in the DR region.
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.
- ✓
Pilot light
Why this is correct
Pilot light keeps only core components running in the secondary Region, which lowers cost while reducing recovery time.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Pilot light keeps core services running in the DR region.
- ✓
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.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Pilot light keeps core services running in the DR region.
- ✗
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.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the distinction between pilot light and warm standby by making candidates confuse the minimal 'pilot light' core with a fully scaled 'warm standby' environment, or by assuming that backup and restore can meet a few-hour RTO when it typically cannot due to provisioning and data restoration latency.
Detailed technical explanation
How to think about this question
Pilot light uses continuous replication (e.g., Amazon RDS cross-Region read replicas or DynamoDB global tables) to keep a minimal data plane warm, while Warm standby runs a scaled-down but fully functional copy of the production environment (e.g., a smaller EC2 Auto Scaling group and a smaller RDS instance) that can be scaled up via pre-configured launch templates and Application Auto Scaling. In a real-world scenario, the pilot light pattern might use Route 53 health checks to trigger a CloudFormation template that deploys additional EC2 instances from an AMI, while warm standby might use a weighted DNS policy to shift traffic to the standby Region after scaling.
KKey Concepts to Remember
- Pilot light keeps core services running in the DR region.
- Data is continuously replicated to the DR region.
- Non-critical components are provisioned on demand during failover.
- Offers a balance between cost and recovery time (RTO).
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Pilot light keeps core services running in the DR region.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Review pilot light keeps core services running in the DR region., then practise related SAA-C03 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Resilient Architectures — This question tests Design Resilient Architectures — Pilot light keeps core services running in the DR region..
What is the correct answer to this question?
The correct answer is: Pilot light — Pilot light is correct because it maintains a minimal, always-running core infrastructure (e.g., a small database and application server) in the secondary Region, replicating data continuously. During a regional outage, you can rapidly scale up the environment by provisioning additional resources (e.g., EC2 instances from pre-baked AMIs) to become fully active, meeting the recovery time objective (RTO) of a few hours while keeping ongoing costs lower than a fully active second Region.
What should I do if I get this SAA-C03 question wrong?
Review pilot light keeps core services running in the DR region., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Pilot light keeps core services running in the DR region.
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Last reviewed: Jun 30, 2026
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