Configuration Server (CS) has a MySql installed in it, which holds a lot of information like the replicated items and the discovered items etc.
If the CS is lost, then there can be issues with replication and failback/protection of new items are not possible. So we need to have backups for the Configuration Server.
Please refer:
https://learn.microsoft.com/en-us/azure/site-recovery/vmware-azure-common-questions#should-i-back-up-the-configuration-server
If you are using a scale out Process Server (PS), and if that goes down, that could be handled by switching the traffic to a new PS.
Please Refer: https://learn.microsoft.com/en-us/azure/site-recovery/vmware-azure-manage-process-server#switch-an-entire-workload-to-another-process-server
------------------------------------------------------------------------------------------------------------------------------
If an Answer is helpful, please “Accept Answer” or Up-Vote for the same which might be beneficial to other community members reading this thread.