In theory it seems to be possible to migrate the Orient DB to another server, after migrating a couple of configuration files of the Portal do need to be alter to reflect the new OrientDB server. In C:\Program Files\CA\CA Test Data Manager Portal\conf you will need to alter the application.properties and catdmshredder.properties. Look for the graphdb section in the files.
OrientDB comes with its own interface which can be accessed on http://<HOSTNAME>:2480/studio/index.html using the user and password as given during installation of CA TDM Portal. This interface provides an export to JSON format which can than be imported by using the OrientDB command line console.
OrientDB Server can export the database in JSON format. Click the Export Database button to download a gzip compressed file containing the JSON file. You can re-import it by using OrientDB command line console.
Best regards,
Peter