2014-05-07 16:37:58: ERROR: Writing to file failed
2014-05-07 16:37:58: ERROR: Last error: 665
2014-05-07 16:37:58: ERROR: FATAL: Error writing to VHD-File.
Code 665 - see http://msdn.microsoft.com/en-us/library/windows/desktop/ms681388(v=vs.85).aspx
[quote=""]ERROR_FILE_SYSTEM_LIMITATION
665 (0x299)
The requested operation could not be completed due to a file system limitation.
[/quote]
Probably caused by a large compressed image backup. See http://blogs.msdn.com/b/ntdebugging/archive/2008/05/20/understanding-ntfs-compression.aspx for the limits of NTFS compression.
I have kind of anticipated this and implemented image compression in UrBackup Server 1.4 . You cannot mount the images directly then, though.