Inconsistent...
 

I purchased SuperDuper! for two computers and have two to go BUT I can't get it to operate consistently. I have only had one complete good run on each computer and the rest of the time I get the message: Last backup: delayed.
I am attempting a complete duplication of my HD to an external HD -- much larger capacity than computer HD so space is not a problem. Just starts out
fine but doesn't complete.

Last backup: delayed? That's not our message. That sounds like Time Machine.