A company stores database backups in an Amazon S3 bucket. The backup files average 10\text… — AWS Certified Solutions Architect - Associate

A company stores database backups in an Amazon S3 bucket. The backup files average $10\text{ GB}$ in size. The backups are accessed frequently for the first $15\text{ days}$ for verification. After $15\text{ days}$ , they are rarely accessed, but the company must retain them for a total of $25\text{ days}$ for emergency recovery before they are permanently deleted. Which S3 lifecycle configuration provides the most cost-effective storage solution for these backups?

A
Configure a lifecycle rule to transition the backups to Amazon S3 Standard-Infrequent Access (S3 Standard-IA) after $15\text{ days}$ , and delete them after $25\text{ days}$ .
B
Configure a lifecycle rule to transition the backups to Amazon S3 Glacier Flexible Retrieval after $15\text{ days}$ , and delete them after $25\text{ days}$ .
Keep the backups in Amazon S3 Standard, and configure a lifecycle rule to permanently delete them after $25\text{ days}$ .Answer
D
Configure a lifecycle rule to transition the backups to Amazon S3 Intelligent-Tiering after $15\text{ days}$ , and delete them after $25\text{ days}$ .

Answer

Keep the backups in Amazon S3 Standard, and configure a lifecycle rule to permanently delete them after

25\text{ days}

Keeping the database backups in Amazon S3 Standard for the entire

25\text{ days}

and deleting them via a lifecycle rule is the most cost-effective option. Because the backups are deleted at day

25

, any transition to S3 Standard-IA at day

15

results in only

10\text{ days}

of storage in the Infrequent Access tier. S3 Standard-IA charges a minimum of

30\text{ days}

of storage, meaning the user would pay for

30\text{ days}

of S3 Standard-IA storage in addition to the

15\text{ days}

of S3 Standard storage, resulting in a higher total cost.

Step-by-Step Solution

Calculate the storage cost of keeping backups in Amazon S3 Standard for

25\text{ days}

Storage cost is calculated based on the actual duration of

25\text{ days}

without any minimum storage duration penalty.

Amazon S3 Standard has no minimum storage duration constraints.

Evaluate S3 Standard-IA cost constraints for the remaining

10\text{ days}

of retention.

Transitioning to S3 Standard-IA at day

15

and deleting at day

25

means the data resides in S3 Standard-IA for only

10\text{ days}

. Because S3 Standard-IA enforces a

30\text{ days}

minimum storage charge, the company is billed for

30\text{ days}

of IA storage, which offsets the tier's lower rate and increases overall costs.

Identifying the S3 Standard-IA minimum duration rule is critical to avoiding unexpected cost penalties.

Evaluate Amazon S3 Glacier Flexible Retrieval and S3 Intelligent-Tiering constraints.

S3 Glacier Flexible Retrieval enforces a

90\text{ days}

minimum storage duration. S3 Intelligent-Tiering requires

30\text{ consecutive days}

of no access to tier down, which cannot be met within a

25\text{ days}

lifespan, and adds monitoring charges.

Confirming that alternative tiers are more expensive due to early deletion penalties or tiering requirements.

Key Concept

S3 Storage Class Minimum Duration Constraints

Estimated Time:1m 30s

Question

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Topics