Sometimes it is necessary to change or update a data replication engine. A zero downtime migration will impose no downtime on either applications or users. The migration can take place during normal working hours and occur over an extended time, while the backup database is always available and fully synchronized with the production database. Therefore, application availability is ensured during the migration process. This migration technique is similar to HPE Shadowbase Zero Downtime Migration (ZDM) that customers have been using for decades to upgrade their applications, database schema formats, file and table locations (or indices), operating systems, or perform a hardware refresh. In this article, we describe how a data replication engine can be changed without taking down either applications or the backup database.