The official way is only if it was originally imported into EC2
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ExportingEC2Instances.html
If you have previously imported an instance into Amazon EC2, you can
use the command line tools to export that instance to Citrix Xen,
Microsoft Hyper-V, or VMware vSphere. Exporting an instance can be
useful when you want to deploy a copy of your EC2 instance in your
on-site virtualization environment.
You cannot export an instance unless it was previously imported into AWS
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