Well this won’t work since my FULL always shows errors
To the best of my knowledge, DIFF will not look at the success or failure of any preceeding jobs
What a DIFF does is look at the Archive Bit (unless you are trying to use Modified Time). It the Bit is set (that is, if the file has changed since the last FULL or INCR) the file is backed up, but the Bit is left alone. (An INCR would do the same check, but reset the bit after the file is backed up)