AWS Certified Solutions Architect - Associate
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A company runs applications on Amazon EC2 instances in one AWS Region. The company wants to back up the EC2 instances to a second Region. The company also wants to provision EC2 resources in the second Region and manage the EC2 instances centrally from one AWS account.
Which solution will meet these requirements MOST cost-effectively?
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A
Create a disaster recovery (DR) plan that has a similar number of EC2 instances in the second Region. Configure data replication.
B
Create point-in-time Amazon Elastic Block Store (Amazon EBS) snapshots of the EC2 instances. Copy the snapshots to the second Region periodically.
C
Create a backup plan by using AWS Backup. Configure cross-Region backup to the second Region for the EC2 instances.
D
Deploy a similar number of EC2 instances in the second Region. Use AWS DataSync to transfer the data from the source Region to the second Region.
Explanation:
Explanation
Option C (AWS Backup with cross-Region backup) is the MOST cost-effective solution because:
- AWS Backup is a fully managed backup service that provides centralized backup management across AWS services.
- Cross-Region backup allows you to automatically copy backups to another AWS Region for disaster recovery purposes.
- Cost-effectiveness: AWS Backup eliminates the need to maintain duplicate EC2 instances in the second Region (unlike options A and D), which would incur ongoing compute costs. It also provides automated, policy-based backup management without manual intervention.
- Centralized management: AWS Backup provides a single console to manage backups across multiple AWS services and Regions from one AWS account.
- Efficient data transfer: Cross-Region backup copies only incremental changes after the initial backup, reducing data transfer costs compared to periodic full snapshot copies.
Why other options are less cost-effective:
- Option A: Requires maintaining duplicate EC2 instances in the second Region, incurring ongoing compute costs even when not actively used.
- Option B: Manual snapshot creation and copying is labor-intensive and doesn't provide centralized management. It also requires manual coordination and may not be as cost-effective for frequent backups.
- Option D: Similar to option A, requires maintaining duplicate EC2 instances plus additional DataSync costs for data transfer.
Key AWS services mentioned:
- AWS Backup: Centralized backup service for automating and managing backups across AWS services
- Cross-Region backup: Feature of AWS Backup that automatically copies backups to another AWS Region
- Amazon EC2: Elastic Compute Cloud for virtual servers
- Amazon EBS: Elastic Block Store for block-level storage volumes
- AWS DataSync: Data transfer service for moving data between AWS storage services
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