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Difficulty: MediumBackup and Restore Management

A SysOps Administrator is setting up Amazon S3 Cross-Region Replication (CRR) to meet disaster recovery compliance requirements for an application's backup files. The administrator configures the replication rule on the source bucket, specifying a destination bucket in another Region. However, after uploading new backup files to the source bucket, the administrator notices that replication is not occurring. Which configuration step was omitted, preventing the replication from functioning?

  1. Versioning was not enabled on both the source and destination S3 buckets.Answer
  2. B
    S3 Object Lock was not enabled on both the source and destination S3 buckets.
  3. C
    An Amazon RDS Read Replica was not configured to sync the replication metadata.
  4. D
    A gateway VPC endpoint for Amazon S3 was not associated with the destination route tables.

Answer

Versioning must be enabled on both the source and destination S3 buckets.
For Amazon S3 Cross-Region Replication (CRR) to function, versioning must be enabled on both the source and destination buckets. This allows S3 to maintain unique version IDs for objects and replicate specific versions across buckets in different Regions.

Step-by-Step Solution

1
Identify the service and feature in use.
The scenario uses Amazon S3 Cross-Region Replication (CRR) for replicating backup files.
Understanding the core service helps isolate the prerequisites required for that specific feature.
2
Recall the prerequisites for S3 Cross-Region Replication (CRR).
S3 CRR requires bucket versioning to be enabled on both the source and destination buckets.
Since replication relies on version IDs to track and sync updates, versioning is a hard requirement for CRR.
3
Evaluate the options against the CRR requirements.
Enabling versioning on both source and destination buckets is the only requirement listed that is mandatory for CRR.
This isolates the correct answer by filtering out database replication, network routing, and object lock compliance features.

Key Concept

Amazon S3 Cross-Region Replication Requirements
Estimated Time:1m 30s
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Topics

Backup and Restore Management

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