Is it possible to introduce a new Active Directory (AD) to establish redundancy, so that when one AD becomes non-operational, the other takes over its functions?

This configuration is possible, but pay attention to these guidelines.

Ensure to set the primary AD as order 1 and the secondary AD as order 2. Be careful during information replication, ensure that the same details from server 1 are present on server 2, except for the host field.