If you want to create a Active Directory Snapshot, you can use ntdsutils.
Go to a Powershell or cmd window and write ntdsutil -> snapshot
Activate the instance for AD with activate instance ntds command
Finally create the snapshot with create command
When you need to install a domain controler in a brach office that sometimes have connectivity network problems or a domain controler that you cant administrate, you can install a RODC or Read Only Domain Controler. This Domain Controler is only for read, you cant create new users, computer or other in this server, but if you install this server in a branch office, the users and computer in this place, the people can login in their computers and obtein other benefits.
First of all you need to ensure that your funtional level domain is 2008 or higher.
You have two options for install this type of Domain Controlers.
When you add a computer in your domain, always it goes to Computer OU. For example, this will be a problem because you can apply any Policy to this OU. If you want to solve this problem you can create a new OU in your AD.
I create the OU NewComputers. Now I need to do a redirect in AD for all computers that I add to the domain goes directly to NewComputers. This is the command:
redircmp ou=NewOU dc=domain,dc=com
The next computer that you add to domain gone to the OU that you specify in the command redircmp.
We know that Windows Server have 2 differents versions, the standard with Graphical mode and the Core Edition. But in Windows 2012 Server you can make an intermediate version behind graphical and core. This version is named Minimal Server Interface. This version is a mix. It version have the adventages that a core edition but make easy your work because it have same graphical options like Server Manager.
If you want to convert a Graphical mode in Minimal Server Interface you need to remove the feature Server Graphical Shell, and if you have a Core edition you need to add Graphical Management Tools and Infraestructure
WINSxS is a folder inside C:\Windows. In this folder the Operating System have all roles and features that you can to install and unistall in your system.
If you have space problem in your system you can remove same of this exes and save some space in your computer. For example, you want to remove the exec from GUI shell you can exec this command
Uninstall-Feature Server-GUI-Shell -Remove
Whit the option -REMOVE, you delete the installation folder for this Feature. If in the future you want to install this feature, there isn´t any problem, because if you launch Install-Feature, windows server try to find the installation packet in the WINSxS folder, if this folder isnt in WINSxS, the system download from Windows Update. If you dont have internet you can use the option -SOURCE and install this from a CD with Windows server 2012.