The answer is that the automated backups were deleted prematurely because the RDS instance was deleted, which automatically deletes all automated backups regardless of the retention period. This is a fundamental behavior of Amazon RDS: automated backups and transaction logs are tied to the lifecycle of the database instance, so when the instance is terminated, all associated automated backups are removed immediately, even if the retention window is set to 35 days. On the AWS Certified Data Engineer Associate DEA-C01 exam, this concept tests your understanding of the distinction between automated backups and manual snapshots—manual snapshots persist after instance deletion, but automated backups do not. A common trap is assuming that a 35-day retention period guarantees backup availability for that entire duration, but it only applies while the instance exists. Remember the memory tip: "Delete the DB, delete the backups—manual snaps are the only ones that last."
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 healthcare company uses Amazon RDS for PostgreSQL to store patient records. The database has a size of 1 TB and is running on a db.r5.large instance. The company requires that the database be highly available and have automated backups with point-in-time recovery (PITR) for the last 35 days. The operations team has configured Multi-AZ deployment and automated backups with a 35-day retention period. During a recent disaster simulation, the team attempted to restore the database to a point in time from 30 days ago. The restore operation failed because the backup was not available. On investigation, the team found that the automated backups were being deleted before the retention period ended. The team also noticed that the database has a large number of transaction logs generating a high volume of write activity. What is the most likely cause of the backups being deleted prematurely?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The RDS instance was deleted, which automatically deletes all automated backups.
Option D is correct because automated backups are retained based on the backup retention period. However, if the database instance is deleted, all automated backups are also deleted. Option A is wrong because manual snapshots are separate from automated backups. Option B is wrong because the backup window does not affect retention. Option C is wrong because Multi-AZ automatically performs backups from the standby, but the retention is still enforced.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The RDS instance was deleted, which automatically deletes all automated backups.
Why this is correct
When an RDS instance is deleted, automated backups are also deleted unless a final snapshot is taken.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The automated backup window was set to a time that conflicted with the database maintenance window.
Why it's wrong here
Backup window conflicts do not cause early deletion.
✗
The Multi-AZ deployment was not enabled during the backup process, causing backups to fail.
Why it's wrong here
Multi-AZ ensures backups are taken from the standby, but retention is still 35 days.
✗
The database had manual snapshots that were deleted manually by the operations team.
Why it's wrong here
Manual snapshots are independent of automated backups.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Data Store Management — This question tests Data Store Management — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The RDS instance was deleted, which automatically deletes all automated backups. — Option D is correct because automated backups are retained based on the backup retention period. However, if the database instance is deleted, all automated backups are also deleted. Option A is wrong because manual snapshots are separate from automated backups. Option B is wrong because the backup window does not affect retention. Option C is wrong because Multi-AZ automatically performs backups from the standby, but the retention is still enforced.
What should I do if I get this DEA-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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