[jdmuys]

I may add, that my first attempts failed because I chose as a destination in SuperDuper a disk image. Whether sparse or not, it doesn't work, because the resulting disk image has a logical volume size equal to the size of the source (including its free space). If that logical size is larger than what can fit on a DVD, then the resulting image cannot be burned.

Note that compacting the disk image with hdiutil doesn't work, because such a compacting is physical, and not logical: the resulting volume size doesn't change.

Suggestion: maybe you could add an advanced option to make the destination image as tight as possible by reclaiming any free space, whether the free space already exists on the source, or because it results from "Ignore" commands in the script.

I hope that helps other fellow developers,

JD