Unable to do a full back up

Been a while since i used CB, came back to find it has a full sector back up option.
Plugged in external hard drive and set it up, get error 5 every time.
My second back up I’ve set works perfectly (a direct file copy to an USB).
Any suggestions? I’ve tried the debug thing and attached whatever it made.

[attachment deleted by admin]

Don’t waste your time doing a full computer image backup to an external drive as CB will cry about it being on an external drive if you ever need to do a restore. You have to put the image on a secondary internal drive to ever be able to use it assuming COMODO ever gets around to making a ■■■■ boot CD for the ■■■■ CB program.