- A
Add a lifecycle rule to transition backups older than 1 day to S3 Glacier Flexible Retrieval, and keep them until day 90.
Glacier Flexible Retrieval is intended for backups with infrequent access and supports restores within an RTO measured in hours.
- B
Add a lifecycle rule to transition backups older than 1 day to S3 Glacier Instant Retrieval, and keep them until day 90.
Why wrong: Instant Retrieval can meet the RTO but usually costs more than Flexible Retrieval for infrequent backups.
- C
Add a lifecycle rule to transition backups older than 1 day to S3 Glacier Deep Archive, and keep them until day 90 with no restore configuration.
Why wrong: Deep Archive restore times are typically longer and may conflict with a strict 24-hour RTO expectation.
- D
Add a lifecycle rule to transition backups older than 1 day to S3 One Zone-IA, and delete them after 7 days.
Why wrong: One Zone-IA reduces cost but deletion after 7 days breaks the required 90-day retention.
SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized 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 SaaS company uses an S3 bucket for database backups created daily. Backups are rarely restored; the company’s documented RTO is 24 hours, and the compliance policy requires backups be kept for 90 days. The team currently stores all backups in S3 Standard, which is costly.
Which single lifecycle policy change is most cost-optimized while still meeting the 24-hour RTO and 90-day retention?
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
Add a lifecycle rule to transition backups older than 1 day to S3 Glacier Flexible Retrieval, and keep them until day 90.
Option A is correct because S3 Glacier Flexible Retrieval offers retrieval times ranging from minutes to hours, which comfortably meets the 24-hour RTO, while providing significant cost savings over S3 Standard for data that is rarely accessed. Transitioning backups older than 1 day to this storage class reduces costs without compromising the 90-day retention requirement.
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.
- ✓
Add a lifecycle rule to transition backups older than 1 day to S3 Glacier Flexible Retrieval, and keep them until day 90.
Why this is correct
Glacier Flexible Retrieval is intended for backups with infrequent access and supports restores within an RTO measured in hours.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Add a lifecycle rule to transition backups older than 1 day to S3 Glacier Instant Retrieval, and keep them until day 90.
Why it's wrong here
Instant Retrieval can meet the RTO but usually costs more than Flexible Retrieval for infrequent backups.
- ✗
Add a lifecycle rule to transition backups older than 1 day to S3 Glacier Deep Archive, and keep them until day 90 with no restore configuration.
Why it's wrong here
Deep Archive restore times are typically longer and may conflict with a strict 24-hour RTO expectation.
- ✗
Add a lifecycle rule to transition backups older than 1 day to S3 One Zone-IA, and delete them after 7 days.
Why it's wrong here
One Zone-IA reduces cost but deletion after 7 days breaks the required 90-day retention.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose S3 Glacier Deep Archive for maximum cost savings without considering that its standard retrieval time (12 hours) could fail to meet the 24-hour RTO under load or without expedited retrieval, which adds cost and complexity.
Detailed technical explanation
How to think about this question
S3 Glacier Flexible Retrieval (formerly S3 Glacier) uses a three-tier retrieval model: expedited (1–5 minutes), standard (3–5 hours), and bulk (5–12 hours). For a 24-hour RTO, standard retrieval is sufficient and cost-effective, as it avoids the higher per-GB retrieval costs of expedited or the latency of Deep Archive. Lifecycle policies evaluate object age based on the last modified date, so transitioning after 1 day ensures the most recent backup remains in S3 Standard for immediate access, while older backups are moved to cheaper storage.
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
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Cost-Optimized Architectures — This question tests Design Cost-Optimized Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a lifecycle rule to transition backups older than 1 day to S3 Glacier Flexible Retrieval, and keep them until day 90. — Option A is correct because S3 Glacier Flexible Retrieval offers retrieval times ranging from minutes to hours, which comfortably meets the 24-hour RTO, while providing significant cost savings over S3 Standard for data that is rarely accessed. Transitioning backups older than 1 day to this storage class reduces costs without compromising the 90-day retention requirement.
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.
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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