[dnanian]

It's because you're looking for it to do something it doesn't do, J. As explained in the introduction to the User's Guide, SD! doesn't keep old versions of files. So, if you have a single file on the drive named "A", and you make a copy, you'll have A on the destination. If you modify A and copy again, it'll replace the old A with the new A.

The "old rubbish", though, depends. If you're copying to an image, it's not going to touch the stuff "outside" the image. If you mean after you copy once and then update the image, it'll overwrite the "same file" in the image.

Make more sense?