Assuming 10:1 compression, you have 50 exabytes, and it appears that would be about 500 of the trucks Amazon uses to load large amounts of data. I can't find information on how many they actually have, or whether the capacity has increased from the 100 PB figure mentioned in a lot of places.

Amazon's FAQ is funny:

"Q: Can I export data from AWS with Snowmobile?

Snowmobile does not support data export. It is designed to let you quickly, easily, and more securely migrate exabytes of data to AWS"

...you can check out any time you like, but you can never leave.