- A
Pilot light: replicate databases and store backups, keep only minimal infrastructure in the secondary Region, and scale up fully during failover.
Why wrong: Pilot light can work for some RTO goals, but fully scaling dependencies within 2 hours may be difficult depending on application initialization and data warm-up.
- B
Warm standby: keep a scaled-down application environment and database replication active in the secondary Region, using automated failover controls.
Warm standby aligns with moderate RTO requirements by having ready-to-run resources plus continuous replication to meet the RPO target during failover.
- C
Backup and restore only: rely on daily automated backups and restore into the secondary Region during an incident.
Why wrong: Daily backups cannot meet a 15-minute RPO, and restoration time would likely exceed the 2-hour RTO.
- D
Multi-site active-active: run both Regions at full capacity and route live traffic to both simultaneously.
Why wrong: Active-active typically costs more than allowed, and it adds complexity beyond what the budget and requirements describe.
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. A key principle to apply: warm standby maintains a scaled-down, active environment 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 fintech startup uses AWS to run a web API and a PostgreSQL database. They must meet an RPO of 15 minutes and an RTO of 2 hours for a Region-wide disaster. Budget allows running a small, always-on set of infrastructure in a secondary Region, but not full production capacity. The team wants a DR approach that is regularly testable without large manual effort.
Which disaster recovery strategy is the best fit?
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.
Clue:
"always"Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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
Warm standby: keep a scaled-down application environment and database replication active in the secondary Region, using automated failover controls.
Warm standby (B) is the best fit because it maintains a scaled-down but fully functional application environment in the secondary Region with active database replication, meeting the RPO of 15 minutes via synchronous or near-synchronous replication (e.g., PostgreSQL streaming replication or AWS DMS with ongoing replication). Automated failover controls (e.g., Route 53 health checks and Lambda automation) can achieve the RTO of 2 hours by scaling up the standby environment, and the always-on infrastructure allows regular, low-effort testing of the failover process without manual intervention.
Key principle: Warm standby maintains a scaled-down, active environment 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.
- ✗
Pilot light: replicate databases and store backups, keep only minimal infrastructure in the secondary Region, and scale up fully during failover.
Why it's wrong here
Pilot light can work for some RTO goals, but fully scaling dependencies within 2 hours may be difficult depending on application initialization and data warm-up.
- ✓
Warm standby: keep a scaled-down application environment and database replication active in the secondary Region, using automated failover controls.
Why this is correct
Warm standby aligns with moderate RTO requirements by having ready-to-run resources plus continuous replication to meet the RPO target during failover.
Clue confirmation
The clue words "best", "always" in the question point toward this answer.
Related concept
Warm standby maintains a scaled-down, active environment in the DR Region.
- ✗
Backup and restore only: rely on daily automated backups and restore into the secondary Region during an incident.
Why it's wrong here
Daily backups cannot meet a 15-minute RPO, and restoration time would likely exceed the 2-hour RTO.
- ✗
Multi-site active-active: run both Regions at full capacity and route live traffic to both simultaneously.
Why it's wrong here
Active-active typically costs more than allowed, and it adds complexity beyond what the budget and requirements describe.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'pilot light' with 'warm standby' because both involve a secondary Region with minimal resources, but pilot light lacks pre-provisioned application servers and automated failover, making it unsuitable for the stated RTO and testability requirements.
Detailed technical explanation
How to think about this question
Warm standby typically uses AWS services like RDS Multi-AZ with cross-Region read replicas or Aurora Global Database to achieve sub-15-minute RPO via asynchronous replication, while the scaled-down environment (e.g., EC2 Auto Scaling with minimum instances) can be fronted by an Application Load Balancer that is pre-configured but not serving traffic. During failover, Route 53 DNS failover triggers scaling policies (e.g., increasing desired capacity) and database promotion, with RTO dependent on DNS propagation (typically under 60 seconds) and instance launch times (minutes), making 2 hours achievable even with cold caches.
KKey Concepts to Remember
- Warm standby maintains a scaled-down, active environment in the DR Region.
- Continuous data replication is essential for meeting low RPO targets.
- Automated failover mechanisms are critical for achieving RTO goals.
- Warm standby offers a balance between cost and recovery time objectives.
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
Warm standby maintains a scaled-down, active environment in the DR Region.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Review warm standby maintains a scaled-down, active environment 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 — Warm standby maintains a scaled-down, active environment in the DR Region..
What is the correct answer to this question?
The correct answer is: Warm standby: keep a scaled-down application environment and database replication active in the secondary Region, using automated failover controls. — Warm standby (B) is the best fit because it maintains a scaled-down but fully functional application environment in the secondary Region with active database replication, meeting the RPO of 15 minutes via synchronous or near-synchronous replication (e.g., PostgreSQL streaming replication or AWS DMS with ongoing replication). Automated failover controls (e.g., Route 53 health checks and Lambda automation) can achieve the RTO of 2 hours by scaling up the standby environment, and the always-on infrastructure allows regular, low-effort testing of the failover process without manual intervention.
What should I do if I get this SAA-C03 question wrong?
Review warm standby maintains a scaled-down, active environment 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", "always". 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?
Warm standby maintains a scaled-down, active environment in the DR Region.
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Last reviewed: Jun 11, 2026
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