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Answer: AMI creation for EC2 backup, AMI replication to a secondary Region, and automated deployment with AWS CloudFormation.
The most operationally efficient disaster recovery (DR) solution with a required recovery time objective (RTO) of less than 4 hours and minimal AWS resource utilization during normal operations is to create Amazon Machine Images (AMIs) to back up the EC2 instances, copy the AMIs to a secondary AWS Region, and automate the infrastructure deployment in that secondary Region using AWS CloudFormation. This method leverages automated infrastructure as code, which simplifies and speeds up the process of setting up the environment in the event of a disaster, meeting the RTO requirement efficiently.
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For an EC2-based application, identify the most operationally efficient DR solution with an RTO under 4 hours and minimal AWS resource use in normal operations.
A
AMI creation for EC2 backup, AMI replication to a secondary Region, and automated deployment with AWS Lambda and scripts.
B
AMI creation for EC2 backup, AMI replication to a secondary Region, and automated deployment with AWS CloudFormation.
C
EC2 instance launch in a secondary Region with continuous activity.
D
EC2 instance launch in a secondary AZ with continuous activity.
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