[dnanian]

Great -- glad zeroing worked, Dom.

(Note that there's little point to having a Safety Clone if you don't use it as your boot drive -- or, at the very least, boot from it when you install a system update, so keep that in mind.)

To answer the questions:

1. You update a Safety Clone the same way as any other copy: with Smart Update, usually. But, it depends on what you mean! Do you mean updating the original drive with the changes made to the Safety Clone, or updating the Safety Clone with the contents of the original drive?

2. That's right -- Applications, too, of course! But your personal files, in your Home folder, are shared, so there won't be differences there.