Since I couldn't shut off the start-ups even after logging out and back-in-with-shift, I'll try the manual approach then. This program looks so good that after I looked at the discussions, I paid before I tried. And I suppose if this backup doesn't work properly I can always phone AppleHelp and whine at someone there--about the Safe Boot problem, I mean, not about SD.
--Crossing my fingers--and thanks for the qick responses.