When trying to restore my ntbackup .bak files on Windows 2008 I found that the new backup program Windows Server Backup cannot read the old format.
The solution was actually quite easy.
– Create the directory C:\Program Files (x86)\Ntbackup
– Copy the below files from the WINDOWS\System32 directory on a Windows 2003 server to the directory above:
Run ntbackup.exe , and voila!