Which of the following backup methods will best fulfill your requirements?

You have a server with a 5O0GB Amazon EBS data volume. The volume is 80% full. You need to back up the volume at regular intervals and be able to re-create the volume in a new Availability Zone in the shortest time possible. All applications using the volume can be paused for a period of a few minutes with no discernible user impact.

Which of the following backup methods will best fulfill your requirements?
A . Take periodic snapshots of the EBS volume
B . Use a third party Incremental backup application to back up to Amazon Glacier
C . Periodically back up all data to a single compressed archive and archive to Amazon S3 using a parallelized multi-part upload
D . Create another EBS volume in the second Availability Zone attach it to the Amazon EC2 instance, and use a disk manager to mirror me two disks

Answer: A

Explanation:

EBS volumes can only be attached to EC2 instances within the same Availability Zone.

Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-restoring-volume.html