Use Data Transfer Hub
This guide provides detailed instructions to perform these tasks:
Transferring data cross China Partition
Any data moving out and into the Chinese Partition for AWS has to go through the Chinese Great Firewall. This Great Firewall monitors the content and the size of the data being transferred. If you have too few instances, and are transferring terabytes of data, then that Firewall will block those IP's tied to those few instances. For large use cases of this solution where you might be transferring terabytes of data across Partition, we recommend you spin up multiple instances 200+ and in order to avoid CPU/Memory issues, we recommend using a larger instance type for the AutoScale Group.