I'm debating upgrading from Windows Home Server 2011 to Windows Small Business Server 2011 Essentials. I currently have a mirroring raid setup on the WHS and I would plan to use Acronis to image one of the hard drives in case I wanted to ever go back to WHS. I would initiating install the trial of SBS 2011 Essentials but I would be doing this on that raid. My question, If I install the essentials on that raid and decide I don't want to purchase it and go back to my WHS, how do I do this on the raid? If I go back and image one hard drive with the Acronis image, do I need to do this on both for the raid? Not sure how I do this. Also, I was planning on upgrading my memory from 8GB to 16GB, what the limit for Essentials? I know WHS 2011 had a limit of 8GB. I would like to have a domain to control active directory, I assume this is on essentials? Along with RDP?