BTW, thanks for all the input. My offline scan is still running, in stage 4 now, and a long way to go.
I can't see that both methods scan the same -- my offline method now and always runs for a number of hours, whereas that online scan took less than half an hour, maybe only 15 minutes. I didn't expect it as fast as it was, so wasn't really paying attention, might even have been less than 15 minutes.
BTW, with the R in my code, it also makes repairs.