Did you know that with Windows Server 2012 you can now backup Hyper-V VMs with very little effort and very little configuration? Now, I'm not recommending that you throw out your existing enterprise backup system and standardize on Windows Server Backup in 2012, especially if you are using products like System Center Data Protection Manager (which is fantastic for backup) or Veeam or others. But, in a pinch Windows Server 2012's backup is quite handy.
Before you can use Windows Server Backup, you must add that feature from Server Manager. To do that, launch the Roles and Features wizard and select the Windows Server Backup feature and follow the wizard prompts.
Once installed, you can then launch it from within Administrative Tools | Windows Server Backup. Now, the cool thing about Windows Server Backup is the ability, when configured, to back up to cloud storage. You can, for example, integrate with Windows Azure for online backups. For the purposes of our discussion, we will focus on local backups and in a later blog I will cover backing up to Azure (before my Azure trial account expires).
--> Please see the rest on the blog : http://virtualizationreview.com/blogs/virtual-insider/2013/02/back-up-hyper-v-vms.aspx