Как скопировать настройки с существующего сервера сразу после установки нового:
Sets the Autodiscover SCP in AD for new Exchange servers during installation
https://gallery.technet.microsoft.com/scriptcenter/sets-the-autodiscover-scp-5a642f32 Старый сервер придется восстановить и потом корректно деинсталлировать
Recover Exchange servers
You can recover a lost Exchange server by using the /Mode:RecoverServer switch in unattended mode (from the command line) of Exchange Setup. Since most Exchange server settings are stored in Active Directory, the Setup.exe /Mode:RecoverServer command uses that information during the installation of Exchange on a new server with the same name.
Recovering a lost Exchange server is often accomplished by using new hardware. However, you can also use an existing server that doesn't already have Exchange installed on it.
https://docs.microsoft.com/en-us/exchange/high-availability/disaster-recovery/recover-exchange-servers?view=exchserver-2019