PAS-C01 Migration Practice Question
A company is migrating an SAP ERP system to AWS. The SAP system uses a central instance (CI) and dialog instances. The migration must minimize downtime. Which AWS service should be used to replicate the application servers in near real-time?
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 Elastic Disaster Recovery (AWS DRS)
AWS Elastic Disaster Recovery (DRS) provides continuous replication of block-level data, enabling near real-time replication of application servers. Option A (AWS Backup) is for scheduled backups, not real-time replication. Option B (AWS DataSync) is for one-time data transfers. Option D (Amazon S3 replication) is for S3 objects.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon S3 Replication
Why it's wrong here
S3 Replication is for objects, not EC2 instances.
- ✗
AWS DataSync
Why it's wrong here
DataSync is for one-time or scheduled transfers, not continuous replication.
- ✓
AWS Elastic Disaster Recovery (AWS DRS)
Why this is correct
AWS DRS provides continuous block-level replication for low RPO.
- ✗
AWS Backup
Why it's wrong here
AWS Backup is for backup and restore, not real-time replication.
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 |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PAS-C01 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 PAS-C01 exam.