Many of our teams have successfully used AWS Database Migration Service (DMS) to migrate data to and from AWS. In one of our Digital Transformation engagements, we achieved nearly zero downtime cut-over to the new system as we migrated data from Microsoft SQL Server to an AWS Relational Database Service (RDS) PostgreSQL instance. Such transformations involve many moving parts that require planning and coordination across multidisciplinary teams, but for data migration we're quite happy with DMS. It automatically manages the deployment, management and monitoring of all required resources. Over the years DMS has matured to support several source and target databases, and we continue to like it.