Not able to backup Windows 8 disk with UEFI Secure boot enabled

I'm able to boot from the disc created with B&R 11.5 (build 37608) but when I want to backup the system it starts and fails shortly after that with following:

Code: 0x135003D
Module: 309
Owner: root

and
Code: 0x190009
Module: 408
Owner: root

message: Feature disabled.

Why the feature is disabled? Does this come due to the fact that windows 8 uses UEFI and secure boot?