Hi. I'm currently running Exchange 2013 onsite with a Windows 2008 DC. I have a hot site where I use VEEAM to replicate both the Exchange server and DC. Lately I have been having issues with AD services not starting correctly when restoring the DC with VEEAM. After reading that restoring DC's from replica's can be problematic, I have built a DC that sits at the hot site, which I will use in the event of a disaster recovery. However I'm not sure the best way to go about testing that everything will work correctly in my scenario. Can I disconnect my hot site from my production site, seize the FSMO roles on my DR DC, and start Exchange? What do I need to do when its time to bring the DR DC back online (and connect to my production network)? Is it better just to kill the DR DC and promote a new server once the testing is complete?