Here is our problem. We got a Windows 2008 Enterprise Server acting as active directory domain server. This AD is installed on a server "SERVER_A".
We've got a server "SERVER_B" which has identical configuration both in hardware and software but AD capabilities.
We're defining a backup and restoration process, since in case of catastrophic event, we don't want to loose AD information sited in "SERVER_A" (I'm thinking on Hard Disk crash) or, eventually restore it quickly.
We're wondering whether is any way to have a "Duplicated" domain server in server "SERVER_B" to support AD functionality in case "SERVER_A" was lost, something like a "Domain Server Farm" which were synchronized.
The other option we're considering is performing a regular backup on an external USB hard disk of Active Directory (like snapshot does) sited on "SERVER_A" to perform a restoration on "SERVER_B".
I'm sure there must be a way to solve this problem, but we have recently moved from UNIX technologies to Windows 2008 and we still being a little stuck with this issue.