Use the "BackUp Image Browser" Its part of the installed prog.
From the "Help Files"...
Checking the Integrity of a Backup Image (Backup Image Browser)
You can use Verify Backup Image to determine whether a backup image file is valid or corrupt. Backup Image Browser checks to see that all of the files in the backup image are available for you to open, the internal data structures in the backup image file match the data that is available, and the backup image file can be uncompressed and create the expected amount of data.