Restore Windows Server 2008 R2 from a Windows Server Backup (.vhd)

I have a crashed (BSOD) Windows Server 2008 where i luckily have a backup from the night before the crash. This backup was made by using Windows Server Backup, doing a full system backup on a NAS. This creates a backup as 2 large .vhd files and some other small files in \192.168.56.14\administrator\WindowsBackupImages\Server1\date.
When I boot up the server I can do f8 and go to system repair and get the Windows System Recovery tool. Since the backup is not on the machine, but an external harddrive, it is expected the backup is not found. I've then tried to copy the backup to an external USB harddrive, attach it to the computer, with no luck, and also specify the network location in the recorvery tool. When using the network location I'm prompted for username and password, so I'm sure the NAS is found. I would expect the backup is being listed, but nothing is on the list in any of the cases.
What am I missing or doing wrong?
Really appreciate the help.
– Soren