Assuming that you're trying to clone an existing osx install, you need to have CCC copy everything but the files you specifically don't want. That is, using the "incremental backup of selected items" option go through the folder tree in the left pane and de-select things you do not want copied to your SSD. As you do this, watch the right pane to make sure it has a green circle with "this volume will be bootable" written next to it.