Well, recently Microsoft just released November 2014 Update Rollup for Windows
- RT 8.1
- Windows 8.1
- Windows Server 2012 R2
This update rollup includes all previous updates since April 2014. For those that are interested, you can download from here. This round the update include fixes for Hyper-V that is running Generation 2 virtual machine that uses UEFI firmware support and that has the Secure boot option enabled.
At this moment, some people has feedback on backup issue after updated with Nov 2014. This information has confirmed in TechNet Blog:- Click here for more information. KB3000853 is the one that’s causing the problem and if you encounter similar problem, please uninstall it while MS team come out with a fix or interim solution is install KB2996928. This issue is isolated to Windows Server 2012 and Windows Server 2012 R2 only.
Therefore we strongly recommend that you test this Nov 2014 Update in your test environment before apply to production environment or just hold on for a month.