Redstor Online Backup Plus supports the backup of Microsoft Hyper -V based virtual machines. The Hyper-V virtualization platform is supported for Microsoft Windows Server 2008 R2 and Windows Server 2012.
The client needs to be installed on the Hyper-V host. The backup client then interfaces with the Hyper-V writer on the server in the form of a VSS requester. Simply expand the writer and select the virtual machines disks for backup.