Azure AD Connect Sync staging mode provides high availability for AD Connect by creating a hot-standby server that can take over synchronization in the event the primary AD Connect becomes unavailable. It also provides a platform to test synchronization rule changes and a way to migrate Azure AD Connect Sync to a new server. In this video, we create an Azure AD Connect Sync staging server and use the configuration documenter tool to verify settings between staging and production.
Hybrid Identity with Windows AD and Azure AD
https://www.udemy.com/course/hybrid-identity-and-azure-active-directory/?referralCode=7F62C4C6FD05C73ACCC3
Azure AD Connect Configuration Documenter
https://github.com/Microsoft/AADConnectConfigDocumenter