There has been quite a few threads on this but I could get none of the suggested ways to work on my Mac. The Kemper always ended up with one initialised rig and nothing else.
Then I had a brainwave.
I had been using Stuffit to unpack the kpabackup file. That always worked fine and I could delete as many rigs as I wanted.
Then I used Gui Tar or Better zip to repack the folder (then deleting the .tar extension). This always SEEMED to work but even though the Kemper restored it, it ended up with just one rig and nothing else....until I realsed that I was repacking folders within a folder. So the resulting backup file had a folder in which all the backup folders were stored.
So instead of just dragging the top folder to a new backup file, I simply dragged all the contents.
This worked a treat!
Hope it saves someone else a bit of time!
Probably also applies to a PC
Ken