https://windowsserveressentials.com/2017/03/28/migrate-sbs-2011-standard-to-windows-server-2016/
https://social.technet.microsoft.com/Forums/en-US/fc5cf484-d84e-4e58-b5f3-1638f8357e5e/migrate-sbs-2011-active-directory-to-server-2019-active-directory?forum=smallbusinessserver2011essentials