- 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. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 like PostgreSQL streaming replication) and RTO of 2 hours (via automated failover controls such as Route 53 health checks and AWS Lambda automation). This approach allows regular testing without large manual effort by simply promoting the standby environment, and the budget constraint is satisfied by running only minimal compute resources (e.g., smaller EC2 instances) in the secondary Region.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
When this WOULD be correct
A scenario where the RTO is longer (e.g., 4-6 hours) and the budget is extremely limited, allowing only a small database replica and no pre-provisioned application servers. The team can accept manual scaling steps during failover.
- ✓
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
Read the scenario before looking for a memorised answer.
- ✗
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.
When this WOULD be correct
A company with an RPO of 24 hours and an RTO of 12 hours, where cost is the primary constraint and the application is not critical, would find backup and restore appropriate. For example, a development environment that can tolerate longer recovery times.
- ✗
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.
When this WOULD be correct
A company requires zero RPO and near-zero RTO for a critical application, has sufficient budget to run full production capacity in two Regions, and needs to handle sudden traffic spikes by distributing load across both Regions.
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.
✓Warm standby: keep a scaled-down application environment and database replication active in the secondary Region, using automated failover controls.Correct answer▾
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.
✗Pilot light: replicate databases and store backups, keep only minimal infrastructure in the secondary Region, and scale up fully during failover.Wrong answer — click to see why▾
Why this is wrong here
Pilot light keeps minimal infrastructure in the secondary Region, which does not meet the RTO of 2 hours because scaling up from minimal to full capacity takes longer than 2 hours. The question requires a scaled-down but always-on environment to achieve the RTO.
★ When this WOULD be the correct answer
A scenario where the RTO is longer (e.g., 4-6 hours) and the budget is extremely limited, allowing only a small database replica and no pre-provisioned application servers. The team can accept manual scaling steps during failover.
Why candidates choose this
Pilot light is a well-known AWS DR pattern that balances cost and recovery time, and candidates may overestimate how quickly they can scale up from minimal infrastructure, ignoring the strict 2-hour RTO constraint.
✗Backup and restore only: rely on daily automated backups and restore into the secondary Region during an incident.Wrong answer — click to see why▾
Why this is wrong here
The RPO of 15 minutes cannot be met with daily backups, as data loss could be up to 24 hours. Additionally, restoring from backups would likely exceed the 2-hour RTO due to manual restore and provisioning time.
★ When this WOULD be the correct answer
A company with an RPO of 24 hours and an RTO of 12 hours, where cost is the primary constraint and the application is not critical, would find backup and restore appropriate. For example, a development environment that can tolerate longer recovery times.
Why candidates choose this
Candidates may think backup and restore is the simplest and cheapest option, overlooking the strict RPO and RTO requirements in the question. They might assume automated backups can be restored quickly without considering the manual effort and time involved.
✗Multi-site active-active: run both Regions at full capacity and route live traffic to both simultaneously.Wrong answer — click to see why▾
Why this is wrong here
Multi-site active-active requires both Regions to run at full production capacity simultaneously, which exceeds the budget constraint of running only a small, always-on infrastructure in the secondary Region.
★ When this WOULD be the correct answer
A company requires zero RPO and near-zero RTO for a critical application, has sufficient budget to run full production capacity in two Regions, and needs to handle sudden traffic spikes by distributing load across both Regions.
Why candidates choose this
Candidates may think active-active provides the best availability and failover speed, overlooking the cost implications and the specific budget limitation in the question.
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?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse pilot light with warm standby, assuming minimal infrastructure is sufficient for a 2-hour RTO, but pilot light requires provisioning and configuring application servers during failover, which typically takes longer than 2 hours, whereas warm standby already has the application running and only needs scaling.
Detailed technical explanation
How to think about this question
Warm standby leverages active database replication, such as PostgreSQL streaming replication or AWS Database Migration Service (DMS) with ongoing replication, to maintain a read replica in the secondary Region with a replication lag typically under a few seconds, easily meeting a 15-minute RPO. The scaled-down application environment (e.g., EC2 instances in an Auto Scaling group with minimum capacity) can be quickly scaled up via pre-configured launch templates and Amazon CloudWatch alarms, and automated failover can be orchestrated using AWS Route 53 health checks, AWS Lambda, or AWS Elastic Disaster Recovery (DRS) to achieve the 2-hour RTO. Regular testing is simplified by performing a failover drill in a sandbox environment or by temporarily promoting the standby without impacting production.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
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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 — Read the scenario before looking for a memorised answer..
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 like PostgreSQL streaming replication) and RTO of 2 hours (via automated failover controls such as Route 53 health checks and AWS Lambda automation). This approach allows regular testing without large manual effort by simply promoting the standby environment, and the budget constraint is satisfied by running only minimal compute resources (e.g., smaller EC2 instances) in the secondary Region.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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