The answer is to recreate the EFS file system as a Regional (Standard) file system and enable backups via AWS Backup. EFS One Zone stores data only within a single Availability Zone, so it cannot survive an AZ failure; a Regional EFS file system automatically replicates data across multiple AZs, providing the durability and availability required for critical log data even if an entire zone goes down. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of EFS storage classes and their resilience trade-offs—a common trap is assuming that mounting a One Zone file system from multiple AZs adds durability, but the data itself remains in a single AZ. Enabling backups adds an extra layer of point-in-time recovery, which is a separate but complementary durability measure. Memory tip: think “One Zone = one point of failure; Regional = redundant across zones.”
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 company has a critical application running on Amazon EC2 instances in an Auto Scaling group. The application writes logs to an Amazon EFS file system. The DevOps team needs to ensure that log data is durable and available even if an Availability Zone fails. The EFS file system is currently in one AZ. What should the team do? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable AWS Backup for the EFS file system with daily backups.
Option A is correct because EFS One Zone is not resilient to AZ failure. The team should recreate the file system as EFS Standard (Regional) which stores data across multiple AZs. Option D is correct because enabling backups (e.g., AWS Backup) provides additional durability and point-in-time recovery. Option B (increasing throughput) does not add durability. Option C (using S3) changes the architecture significantly. Option E (mounting from multiple AZs) is possible with EFS Standard but not with One Zone.
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.
✗
Increase the EFS throughput mode to Provisioned.
Why it's wrong here
Throughput mode does not affect data durability across AZs.
✓
Enable AWS Backup for the EFS file system with daily backups.
Why this is correct
Backups provide additional durability and recovery options.
Related concept
Read the scenario before looking for a memorised answer.
✗
Copy the log files to Amazon S3 using a cron job.
Why it's wrong here
This adds complexity and latency; EFS Standard is the native solution.
✓
Recreate the EFS file system as a Regional (Standard) file system.
Why this is correct
EFS Standard replicates data across multiple AZs, providing resilience to AZ failure.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure the EC2 instances to mount the EFS file system from multiple Availability Zones.
Why it's wrong here
With EFS One Zone, you cannot mount from other AZs; you need EFS Standard.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable AWS Backup for the EFS file system with daily backups. — Option A is correct because EFS One Zone is not resilient to AZ failure. The team should recreate the file system as EFS Standard (Regional) which stores data across multiple AZs. Option D is correct because enabling backups (e.g., AWS Backup) provides additional durability and point-in-time recovery. Option B (increasing throughput) does not add durability. Option C (using S3) changes the architecture significantly. Option E (mounting from multiple AZs) is possible with EFS Standard but not with One Zone.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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