Hello,
Does not have a MD5 hash to check ?
With CCM 5.1, when you downloading the file and when you start the update, you can check the number...
I don't no if in CCM 6 is the same, but I could think.
PS : if you want to backup your CCM with an another software that Cisco, you can try with a live CD of any linux distribution and use the utility dd to make a entire image of your HDD. You can save this image on a USB storage. Be sure that you must destroy raid, backup and after recreate raid...
Bye