Windows CA Migration - Testing the Backup

I need to migrate our Certificate Services from one server to a new one.

I am following a guide and there is the stage where you backup the old CA. How do you test that backup? I want to be able to check that backup is going to work before uninstalling the CA on the old server.

UPDATE:

In the screen shot below I have tested restoring to a test VM, the distinguished name when importing the certificate shows the name of the existing server while the destination server is different.