AWS DataSync is now available in the AWS GovCloud (US-East) Region. In June 2019 we also announced that DataSync is available in the AWS GovCloud (US-West) Region. DataSync is an online data transfer service that automates and accelerates copying data between Network File System (NFS) or Server Message Block (SMB) file servers, Amazon S3 buckets, and Amazon Elastic File System (Amazon EFS) file systems. Customers use DataSync to migrate data to AWS, to transfer data to the cloud for analysis and processing, and to replicate data to AWS for archiving or business continuity.  

from Recent Announcements: https://aws.amazon.com/about-aws/whats-new/2019/11/aws-datasync-is-now-available-in-aws-govcloud-us-east/