I have now moved a lot of my smaller customers completely to AzureAD (so no onsite AD controllers at all), as part of their Office 365 plan.   Some of the medium sized ones I have moved AD into Amazon AWS.  I need thee instances.  Two t2.micro's to be the AD controllers, and a third to run Ubuntu and strongswan.  I then build a non-Meraki VPN back to the sites.   A t2.micro is maybe USD$3.50 per month.  So for maybe usd$11 per month you can have redundant AD controllers in the cloud. ... View more