Thanks for the quick reply and your gentle courtesy where others (including myself) might have grumbled RTFM! And thank you also for your courage and trust in making such a great program free. I was glad to register.
I've searched quite a bit more now and not found any evidence that what I want to do is possible, that is, limit SD's scope to a single folder (Users) rather than an entire volume. In combination with Smart Update this would be great for keeping my work files in sync across two different (PPC and Intel) platforms while allowing the system files to be platform-specific. But everything I am reading seems to suggest that SD only operates at the volume level. Is that correct?
Although I'm at negative brownie points right now
I'd like to suggest that the "what's going to happen" text for SU + "backup - user files" be modified. Right now it says "All other directories and files will not be copied". Would it be more complete to say "Other directories and files on the target volume will be erased, but will not be updated from the source volume." ?