How about Differential with SuperDuper!
 

One feature that I love with Aconis True Image on the other platform, is that if you image a drive to a file, you can then do differential images using the original full image as the base.

Any thought to giving SD! this functionality when imaging to a sparseimage?

I like this feature because of the risk you run updating your backup image too often, you may be backing up a problem from your main drive, then the backup becomes worthless. Being able to differentially backup to a seperate file reduces this issue considerably.

Please consider it, it's a neat feature.

Instead, consider rotating backups, Randy... see the Introduction to the User's Guide for some suggestions...

I'll consider, but don't care to have to have a huge drive to do so, differential minimizes the size impact.

Just suggesting/hoping for something I consider to be a valuable feature.

Understood, thanks.