Question 1,058 of 1,663
DBS-C01 Deployment and Migration Practice Question
Exhibit
Refer to the exhibit.
```
# CloudFormation snippet
Resources:
MyDBInstance:
Type: AWS::RDS::DBInstance
Properties:
Engine: MySQL
DBInstanceClass: db.t3.medium
AllocatedStorage: 100
MultiAZ: true
DBSubnetGroupName: !Ref MyDBSubnetGroup
VPCSecurityGroups:
- !Ref MySecurityGroup
StorageType: gp2
BackupRetentionPeriod: 7
PreferredBackupWindow: "02:00-03:00"
PreferredMaintenanceWindow: "Sun:05:00-Sun:06:00"
```A company is deploying a MySQL RDS instance using this CloudFormation template. After deployment, they notice that the database is not automatically backed up at the scheduled time. What is the most likely cause?
⚠ Common exam trap
The trap here is that candidates focus on the BackupRetentionPeriod being set to 7 (which is correct) and overlook the storage engine limitation, assuming all MySQL storage engines are equally supported for automated backups in RDS.
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
✓
The BackupRetentionPeriod must be greater than 0 to enable automated backups; however, it is set to 7, so this is not the issue. The actual cause might be that the DB instance is using a storage engine not supported for backups (e.g., MyISAM).
The BackupRetentionPeriod is set to 7, which is greater than 0, so automated backups are enabled. However, the most likely cause of the backup failure is that the DB instance is using a storage engine like MyISAM, which does not support point-in-time recovery or consistent automated backups in Amazon RDS. RDS automated backups rely on the InnoDB storage engine for crash recovery and transaction consistency; MyISAM tables can cause backup failures or incomplete backups.
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 storage type gp2 does not support automated backups.
Why it's wrong here
gp2 supports automated backups.
- ✗
The PreferredBackupWindow is not defined, so backups are disabled.
Why it's wrong here
The template defines a backup window.
- ✗
MultiAZ is enabled, which disables automated backups.
Why it's wrong here
MultiAZ does not disable backups; it is supported with backups.
- ✓
The BackupRetentionPeriod must be greater than 0 to enable automated backups; however, it is set to 7, so this is not the issue. The actual cause might be that the DB instance is using a storage engine not supported for backups (e.g., MyISAM).
Why this is correct
RDS automated backups require InnoDB; MyISAM tables cause backup failure.
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Last reviewed: Jul 4, 2026
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