The AWS Snowmobile pages only talk about migrating INTO AWS, not OUT OF.
from https://aws.amazon.com/snowmobile/ :
AWS Snowmobile is an Exabyte-scale data transfer service used to move extremely large amounts of data to AWS. You can transfer up to 100PB per Snowmobile, a 45-foot long ruggedized shipping container, pulled by a semi-trailer truck. Snowmobile makes it easy to move massive volumes of data to the cloud, including video libraries, image repositories, or even a complete data center migration.
from https://aws.amazon.com/snowmobile/faqs/ :
Q: What is AWS Snowmobile?
AWS Snowmobile is the first exabyte-scale data migration service that allows you to move very large datasets from on-premises to AWS.