- A
AWS Snowball
Why wrong: Snowball transfers data physically via hardware devices — it's for large one-time migrations, not recurring scheduled synchronization.
- B
Amazon S3 Transfer Acceleration
Why wrong: Transfer Acceleration speeds up S3 uploads over the internet but doesn't detect file changes or automate ongoing synchronization with on-premises servers.
- C
AWS DataSync
DataSync automates file transfers between on-premises and AWS storage, detecting changed files, scheduling recurring syncs, validating data integrity, and encrypting transfers.
- D
AWS Storage Gateway
Why wrong: Storage Gateway provides hybrid cloud storage (file gateway, volume gateway, tape gateway) for on-premises applications — DataSync is specifically for data migration and synchronization tasks.
Quick Answer
The answer is AWS DataSync. This service is specifically designed to synchronize files from on-premises to S3 on a schedule, using incremental transfers that detect and copy only the changed files, which avoids re-transferring entire datasets and reduces bandwidth usage. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your ability to distinguish between storage-focused services: DataSync handles recurring, scheduled syncs, while AWS Storage Gateway (File Gateway) provides live, on-demand access to S3 without built-in scheduling or incremental change detection. A common trap is confusing DataSync with AWS Transfer Family, which is for third-party SFTP/FTPS transfers, not native S3 sync. Remember the memory tip: DataSync is like a “sync robot” that follows a schedule and only moves the delta, making it the correct choice for automated, incremental file synchronization between on-premises servers and S3.
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 needs to synchronize files between their on-premises file server and Amazon S3 on a recurring schedule, detecting and copying only the changed files. Which AWS service is designed for this use case?
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
AWS DataSync
AWS DataSync is purpose-built for automating and accelerating the transfer of data between on-premises storage systems and AWS storage services, including Amazon S3. It supports incremental, scheduled transfers that detect and copy only changed files, making it the ideal choice for recurring file synchronization with S3.
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.
- ✗
AWS Snowball
Why it's wrong here
Snowball transfers data physically via hardware devices — it's for large one-time migrations, not recurring scheduled synchronization.
- ✗
Amazon S3 Transfer Acceleration
Why it's wrong here
Transfer Acceleration speeds up S3 uploads over the internet but doesn't detect file changes or automate ongoing synchronization with on-premises servers.
- ✓
AWS DataSync
Why this is correct
DataSync automates file transfers between on-premises and AWS storage, detecting changed files, scheduling recurring syncs, validating data integrity, and encrypting transfers.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Storage Gateway
Why it's wrong here
Storage Gateway provides hybrid cloud storage (file gateway, volume gateway, tape gateway) for on-premises applications — DataSync is specifically for data migration and synchronization tasks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse AWS Storage Gateway's file gateway with DataSync, but file gateway provides a live file server interface to S3 rather than a scheduled, agent-based sync tool for changed files.
Detailed technical explanation
How to think about this question
AWS DataSync uses a lightweight agent deployed on-premises to connect to NFS, SMB, or self-managed object storage, and it leverages a purpose-built network protocol to minimize latency and maximize throughput. It can perform incremental transfers by tracking file metadata (e.g., modification time, size) and only copying changed files, with support for scheduling via CloudWatch Events or DataSync task schedules. In real-world scenarios, DataSync can handle millions of files and is often used for initial bulk migrations followed by ongoing incremental syncs.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Cloud Technology and Services — study guide chapter
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS DataSync — AWS DataSync is purpose-built for automating and accelerating the transfer of data between on-premises storage systems and AWS storage services, including Amazon S3. It supports incremental, scheduled transfers that detect and copy only changed files, making it the ideal choice for recurring file synchronization with S3.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CLF-C02 exam.
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