Not quite dev-related, but I once had to migrate and replace a Windows Server 2003 Domain (1 DC) to a new Windows Server 2016 Domain Controller. The network consisted of about 30 PCs, 1 DC and 1 DB Server.
Eventhough it worked, I wouldn't do it again... 😰
At the beginning I almost deleted the old Domain Controller VM from the old ESXi host server, before any VM backup existed. Close one...