amazon ec2 - EC2 retirement - Meteor / MongoDB

I am hosting my Meteor Application on an Amazon EC2
instance. Today I got a mail that my instance is scheduled for retirement until the end
of month. I don't have any experience with that and what are the best ways to handle the
situation.

My root device type is
ebs.

Amazon suggests: "We recommend that you
launch replacement instances and start migrating to
them."

I already created an AMI Image of my
instance and launched it. Unfortunatly my app can't be reached. At the moment the
running instance can be reached via web and ssh. Is there any best
practice?

Thanks in
advance

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