Japp, reparerat rättigheter genom att köra Cocktail. Det hjälpte inte.
Svar från supporten Superduper:
"It looks like the backup has some subtle damage. I'd suggest reinstalling the OS to the drive you want to restore to (and erase-and-install). Then, when it prompts you to "copy from another Mac", point it at the backup volume with the "volume attached to this Mac" option.
That'll bring in your applications and data, and leave the damage behind.
Once you're satisfied with the result, your next backup should be an erae-then-copy to clear the low-level damage that's present on the backup.
Hope that helps!"
Så nu har jag lite jobb att göra. Återkommer när det är gjort med rapport. Tack för intresse och förslag.