Leopard problems OTHER than booting?
 

I understand that there are problems with SuperDuper! and Leopard with bootable volumes, but I also use SD to just copy critical folders to a portable drive. Is that much working OK on Leopard?

The data should be fine. The metadata might not be.

Thanks for the quick reply, Dave... can you "define" metadata? May I assume it's data outside my files? Are the attributes kept by the system (e.g., modification date, permissions) also metadata? Or, by metadata, do you mean only SD-related data?

Yes, the various attributes, ownership, ACLs, etc.