- A
Use the EFS console to recover the directory from the .Trash folder.
Why wrong: EFS does not have a .Trash folder.
- B
Enable EFS replication to another region and then fail back.
Why wrong: Replication is for disaster recovery, not point-in-time recovery.
- C
Use AWS Backup to restore the entire file system to an on-premises server, then copy the directory back.
Why wrong: Unnecessarily complex and slower.
- D
Restore the backup from 2 days ago to a new EFS file system, then copy the directory to the original file system.
This allows selective directory recovery from the backup.
Question 315 of 1,546
SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. 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 company uses AWS Backup to back up its Amazon EFS file system daily. The backup retention policy is set to 30 days. Recently, a user accidentally deleted a critical directory. The company wants to restore the directory as it existed 2 days ago. What is the MOST cost-effective and quickest way to achieve this?
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
✓
Restore the backup from 2 days ago to a new EFS file system, then copy the directory to the original file system.
Option D is correct because AWS Backup creates point-in-time snapshots of EFS file systems. Restoring a backup from 2 days ago to a new EFS file system allows you to mount that new file system, copy the specific directory back to the original file system, and then delete the temporary file system. This is the most cost-effective and quickest approach since it avoids moving data to on-premises servers and uses native AWS services without additional replication costs.
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.
- ✗
Use the EFS console to recover the directory from the .Trash folder.
Why it's wrong here
EFS does not have a .Trash folder.
- ✗
Enable EFS replication to another region and then fail back.
Why it's wrong here
Replication is for disaster recovery, not point-in-time recovery.
- ✗
Use AWS Backup to restore the entire file system to an on-premises server, then copy the directory back.
Why it's wrong here
Unnecessarily complex and slower.
- ✓
Restore the backup from 2 days ago to a new EFS file system, then copy the directory to the original file system.
Why this is correct
This allows selective directory recovery from the backup.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume AWS Backup can restore directly into the original EFS file system, but AWS Backup for EFS always creates a new file system during restore, requiring a manual copy step to recover specific data.
Detailed technical explanation
How to think about this question
AWS Backup for EFS uses EFS's native backup feature, which creates incremental backups using the EFS `DescribeBackupPolicy` and `PutBackupPolicy` APIs. When restoring, you can choose a specific recovery point (e.g., from 2 days ago) and create a new EFS file system; the restore process leverages the underlying EFS file system's ability to mount and access data immediately, even while the restore is still in progress. This allows you to copy only the needed directory without waiting for a full restore to complete, minimizing both time and cost.
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
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Reliability and Business Continuity — study guide chapter
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Reliability and Business Continuity — This question tests Reliability and Business Continuity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Restore the backup from 2 days ago to a new EFS file system, then copy the directory to the original file system. — Option D is correct because AWS Backup creates point-in-time snapshots of EFS file systems. Restoring a backup from 2 days ago to a new EFS file system allows you to mount that new file system, copy the specific directory back to the original file system, and then delete the temporary file system. This is the most cost-effective and quickest approach since it avoids moving data to on-premises servers and uses native AWS services without additional replication costs.
What should I do if I get this SOA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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