Is there a way to get a different return-code when incremental backup didn't actually find a difference?

Hi All,

I am creating incremental backups automatically and prefer not to look at the 
process too much as I've got other things to do :)

In order to avoid keeping "unnecesssary" incremental backups, is there a way 
to get DAR to report if there was actually a change since the reference 
backup?

Thanks,

Joost