The necessary information for creating the BMR Boot Media for DataCenter can be found in the Hiback folder under C:\Program Files\NovaStor\DataCenter\Hiback\vss\bmr\pe-build\README.txt. Open the README.txt file there and follow the instructions on creating the BMR Boot Media.
This file contains the process for creating a boot image, which in the case of recovery is used either from CD / DVD or USB flash drive to the boot of the respective system.
The Windows PE version that ships with the associated Windows ADK for Windows 8/2012 is PE 5.1.
The information comes from the article http://www.microsoft.com/en-us/download/details.aspx?id=30652, which is also mentioned in the above README.
You can find out how to perform Bare Metal Recovery in the DataCenter GUI-> Restore-> BMR Guide-> Selection-> Guide.
At the time of this writing, for DataCenter 7.3.2, the README.txt for the BMR Boot Media creation is attached below.