This is incredibly slow: Time Machine has been running for just over three hours: ZZ1F876073.jpg SuperDuper! completed a full backup of the same amount of data in just under that time. It isn’t a problem of the target disk: both programs use the same USB 2.0 target (different volumes, however). Update: There was a Finder process screwing around on the same disk – after killing that off, Time Machine completed in under three hours.