I've updated that statement as follows:
Added support for migrating data from one Mendix database to another Mendix database. You can configure an app to copy all data from an existing database into a new database when starting the application. This migration facility enables you to migrate data from one database vendor to another for the same application, for example from SQL Server to PosgreSQL. Configuration details can be found in the migration settings section on the Custom Settings page. Both databases need to have the same database objects, so they need to have the same application, and the same application version deployed on them.
Does that help?