Cloud Digital Leader Practice Question: A retail company stores petabytes of customer…

A retail company stores petabytes of customer transaction data for compliance reasons. They access data less than once a year but must retain it for 10 years. They want the lowest-cost storage. Which storage class should they choose?

⚠ Common exam trap

Google Cloud often tests the misconception that 'Coldline' is the lowest-cost option because of its name, but Archive is actually cheaper for data accessed less than once a year, and candidates overlook the access frequency and minimum storage duration requirements.

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

✓

Archive storage class

Archive storage class is the correct choice because it is designed for data accessed less than once a year, with the lowest storage cost among Google Cloud storage classes. The customer's requirement of retaining data for 10 years with infrequent access aligns perfectly with Archive's 365-day minimum storage duration and retrieval costs that are higher but acceptable given the rare access pattern.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
Archive storage class
Why this is correct
Archive storage class provides the lowest per-gigabyte storage cost in Cloud Storage and is explicitly designed for data accessed less than once a year. With a 180-day minimum retention period and default millisecond access latency, it aligns perfectly with a 10-year retention strategy for petabytes of transaction data. The rare access pattern means retrieval fees stay negligible, and the 180-day constraint is easily satisfied by the long retention, making Archive the most economical and technically appropriate choice.
✗
Coldline storage class
Why it's wrong here
Coldline storage incurs early deletion fees if data is deleted before 90 days, and the scenario requires 10-year retention with infrequent access, making Archive storage’s 180-day minimum and lower per-gigabyte cost the cheaper choice. This option tempts because Coldline is designed for data accessed roughly once a quarter, and would be correct if the retention period were under three months and retrieval latency of milliseconds were acceptable.
✗
Standard storage class
Why it's wrong here
Standard storage class is optimized for hot data that requires frequent, low-latency access, and it carries a significantly higher per-gigabyte price than Archive. Given that the customer transaction data is accessed less than once a year, the substantial storage cost premium provides no business benefit and would dominate the bill over a decade. Standard also offers no minimum retention period and no retrieval fees, but those advantages are irrelevant when the base storage cost is the primary cost driver for a petabyte-scale archive. Therefore, Standard is the wrong choice for this use case.
✗
Nearline storage class
Why it's wrong here
Nearline storage is a low-cost option intended for data accessed, on average, less than once a month, with a 30-day minimum retention duration. Although cheaper than Standard, Nearline's per-gigabyte price is still roughly 2-3 times higher than Archive; over a 10-year horizon with petabytes, that differential results in enormous unnecessary spend. Additionally, Nearline imposes a minimum storage duration and retrieval fees, but the deciding factor is that the scenario's access frequency—less than once a year—is an order of magnitude lower than Nearline's target. For data this cold, Archive's lower storage cost and aligned access profile make Nearline a cost-inefficient alternative.

Quick reference

AWS S3 Storage Class Comparison

Storage Class	Min Duration	Retrieval	Use Case
S3 Standard	None	Immediate	Frequently accessed data
S3 Standard-IA	30 days	Immediate	Infrequent access, rapid retrieval
S3 One Zone-IA	30 days	Immediate	Non-critical infrequent data
S3 Intelligent-Tiering	None	Immediate–hours	Unknown or changing access patterns
S3 Glacier Instant	90 days	Milliseconds	Archive with instant retrieval
S3 Glacier Flexible	90 days	Minutes–hours	Archive, flexible retrieval
S3 Glacier Deep Archive	180 days	Hours	Long-term compliance archive

Go deeper

Cloud Digital Leader Practice Question: A retail company stores petabytes of customer…

Why each option matters

Option-by-option breakdown

AWS S3 Storage Class Comparison

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