Attach & Detach & Snapshot of EBS
This short video show how to Attach EBS (10GB go2).
EBS is available only in the zone where is created, in this case only in us-east-1a. In that zone we have 2 instances EC2-1 and EC2-2.
You can attach one or another instances. EBS is ONLY AVAILABLE IN AZ.
Later it is possible to detach this EBS volume and attach it to another EC2 (in the same zone).
For backup, you can create Snapshot of your EBS disk and attach it in another region.