@ superman ... thanks

That confirmed what I was thinking... it is quite disappointing though since if I remember correctly, Knoppix had that feature in earlier versions.

In my opinion, it was very useful since one would keep different overlays for specific system on the system itself and not carry every overlay on the usb and then switching names accordingly.

Is there another way to make a backup of all the changes (data, installed software, config) you made on a hard disk and then restore them back? I see there is a backup option in the menu but you have to specify which folders to backup and I am not sure whether it backs up all of UNIONFS