2012 Essentials and Backup Domain Controllers

I understand that 2012 Essentials wants to be the domain controller but what happens if I install a second one on the same network/what is the option for a backup domain controller? Is it recommended to have one 2012E and one 2012S?

As far as I can find you can have a second "replica" domain controller, but you can only have one essentials box in the domain (so the replica would just be Windows Server standard), and that must be the master server, eg it must own the FSMO roles.
Check out
http://blogs.technet.com/b/sbs/archive/2007/10/04/debunking-the-myth-about-additional-domain-controllers-replica-dcs-in-an-sbs-domain.aspx which covers many of the limitations and requirements. It doesn't relate to 2012, but I believe the same rules still
apply.

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    Hi,
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