Thanks so much, Dr. Teeth. Decided to check in and found your reply today; don't know why I did not get the e-mail notification.
I did my first changes-only BU of the partition that holds most of my data today, and it took only 1½ minutes, so that's fast enough.
I am generally using VSS, which, as I understand things, should avoid the risks of /usemd, but since my BU took so little time, I'll not take any chances with /usemd. I will leave "Create Sector Hash Files" checked, as that is now the recommended default and apparently does not add risk.
> >Any reason not to choose the above setting if I am going to enable Use
> Metadata Hash Files?
> They are more risky than not using them. More info here
, it's a forum thread here.