AWS Transform MGN (formerly AWS Application Migration Service) vs Google Cloud Migration Center

AWS Transform MGN automates rehosting physical, virtual, and cloud servers as native Amazon EC2 instances. It continuously replicates source-server data at the block level, converts servers for AWS, and coordinates cutover with minimal downtime. Teams can use an agentic AWS Transform workflow or manage migration steps in the MGN console, switching paths without losing progress. Sources include physical servers, VMware vSphere, Microsoft Hyper-V, other on-premises infrastructure, public clouds, and migrations across AWS Regions, Availability Zones, or accounts. After launch, built-in or custom actions can configure disaster recovery, upgrade operating systems, convert licenses, or install CloudWatch Agent. Servers can be organized into applications and waves for launch, cutover, archival, and configuration operations. MGN supports x86 sources and replication volumes up to 16 TB; larger volumes are not supported. A 90-day free period covers 2,160 hours per source server when used continuously. AWS infrastructure for replication, testing, or cutover is charged separately, and continued replication is charged per hour after the free period.

Google Cloud Migration Center helps plan moves from on-premises systems or other cloud environments to Google Cloud. It estimates future Google Cloud costs from existing resource sizes and configurations, and can inventory servers and Microsoft SQL Server, MySQL, and PostgreSQL databases. Assessments can report total cost of ownership, show application and network dependencies, and suggest destinations based on technical fit. Planning tools offer guidance on what to move and how, including rehost, replatform, and refactor strategies. Infrastructure information can be collected automatically once or continuously, or imported manually. Documented discovery covers AWS assets, Azure virtual machines in preview, and on-premises servers and virtual machines. A Linux and Windows discovery client can create offline reports without sending sensitive data to Google Cloud; the installed client itself runs only on Windows and does not discover databases. The service says it does not collect application or file-storage data. Estimates and assessments cost nothing, though other Google Cloud products may incur charges.