The correct answer is to implement snapshot replication to a secondary region and create a custom image of the boot disk copied to another region. Snapshot replication minimizes both RTO and RPO by scheduling frequent, incremental snapshots that are automatically replicated across regions, allowing you to rapidly create new disks and instances in the disaster recovery site with minimal data loss. The custom image copy strategy complements this by ensuring the boot disk’s exact state—including operating system and application configurations—is available in another region, enabling faster instance creation without relying on snapshot restoration for the base image. On the Google Professional Cloud Architect exam, this question tests your understanding of Compute Engine disaster recovery options, often appearing as a scenario where you must balance cost and speed; a common trap is choosing only one strategy, but the exam requires two for full coverage. Memory tip: think “snapshots for data, images for boot”—snapshots handle incremental data changes, while custom images provide a ready-to-launch boot environment.
Google PCA Practice Question: Analyze and optimize technical and business processes
This PCA practice question tests your understanding of analyze and optimize technical and business processes. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company is designing a disaster recovery plan for a critical application running on Compute Engine with a regional persistent disk. They want to minimize recovery time objective (RTO) and recovery point objective (RPO). Which TWO strategies should they implement? (Choose two.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use snapshot replication to a secondary region.
Option A is correct because snapshot replication to a secondary region allows you to create and store disk snapshots in a different region, enabling rapid recovery of the application in that secondary region. This minimizes RTO by having the snapshots readily available for creating new disks and instances, and minimizes RPO by scheduling frequent, automated snapshots that capture incremental changes, ensuring data loss is limited to the snapshot interval.
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.
✓
Use snapshot replication to a secondary region.
Why this is correct
Snapshots can be replicated to another region for quick restore.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Take manual snapshots after a failure occurs.
Why it's wrong here
Increases RPO because snapshots are taken after failure.
✗
Create an instance template in the same region.
Why it's wrong here
Doesn't help if the region fails.
✗
Store backups in Cloud Storage with a lifecycle policy.
Why it's wrong here
Backups in Cloud Storage are useful but not the fastest for recovery.
✓
Create a custom image of the boot disk and copy it to another region.
Why this is correct
Custom images can be used to recreate instances in another region quickly.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between regional persistent disks (which are synchronous within a region) and cross-region disaster recovery strategies, leading candidates to mistakenly think that a regional persistent disk alone provides cross-region redundancy, when in fact you must explicitly replicate snapshots or images to another region.
Detailed technical explanation
How to think about this question
Regional persistent disks in Compute Engine are replicated synchronously within a single region, but for cross-region DR, you must use snapshot replication or custom images. Snapshot replication uses incremental snapshots stored in Cloud Storage, which can be scheduled via the Snapshot Schedule API to achieve RPOs as low as 10 minutes. Custom images, on the other hand, are full disk copies that can be created from a boot disk and copied to another region using the `gcloud compute images create` and `gcloud compute images deprecate` commands, but they require manual or scripted orchestration and are not incremental, leading to higher storage costs and longer creation times for large disks.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Analyze and optimize technical and business processes — This question tests Analyze and optimize technical and business processes — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use snapshot replication to a secondary region. — Option A is correct because snapshot replication to a secondary region allows you to create and store disk snapshots in a different region, enabling rapid recovery of the application in that secondary region. This minimizes RTO by having the snapshots readily available for creating new disks and instances, and minimizes RPO by scheduling frequent, automated snapshots that capture incremental changes, ensuring data loss is limited to the snapshot interval.
What should I do if I get this PCA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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