I have a client that runs all mac OS's. Not sure of the exact versions, but they are all fairly new machines. I have read numerous posts about the connector not being able to run successfully, which is a concern of mine, but my main concern is what happens to the local user\admin account (all associated settings\files\etc.) that is currently being used on the mac (not connected to a domain) I have virtually no experience with mac systems at all.  When it successfully joins the domain, you will need to log on with a new domain account I'm assuming, is there a way to copy the settings\files from one account to another?  Any advice, tips, tricks, would be greatly appreciated.  Thanks again in advance.&nb

If they run all macs, I would recommend a Synology disk station over an Essentials Server.

Hi,

Mac client computers running Mac OS X 10.5 (Leopard) or later are supported to connect to Windows Server 2012 R2 Essentials, but some functions on Dashboard are limited, such as computer backup, Remote Web Access to connect a Mac computer. Detailed information about Get Connected in Windows Server Essentials you may reference link below:
https://technet.microsoft.com/en-us/library/jj713510.aspx

As you know that, Connector will help the client computer to join Essentials domain, and after that, you need to log on with domain account. As Windows system, we can backup data under user account folder and then copy the date to domain account. As MAC, it is better to ask the Apple supporter for official support about how to copy data from local account to domain account.

Best Regards,
Eve Wang