@classmethod
def copy(cls, ami, name):
    """ copy ami to your account
        :param ami: any public ami
        :param name: name for saved ami
        """
    from . import Spot, Volume
    instance = Spot(ami)
    instance.start(persistent=True)
    volume = Volume(ami)
    instance.terminate()
    volume.name = name
    snapshot = volume.create_snapshot()
    snapshot.register_image()
    volume.delete()
