5.20.2.2 Recovering a Management Domain and Its User Domains (Releases 12.2.1.1.0 and Later)
You can recover a management domain from a snapshot-based backup when severe disaster conditions damage the management domain, or when the server hardware is replaced to such an extent that it amounts to new hardware.
To use this recovery method, it is assumed that you have previously completed the steps in Backing up the Management Domain dom0 Using Snapshot-Based Backup.
At this point all the user domains should come up along with Oracle Grid Infrastructure and the Oracle Database instances.