Disabled backup on one pc, does it affect others?

I bought Norton 360 for 5 computers I own. I want to backup the data from the first PC, but not from the 2nd, to Norton's online backup.

I set up the default backup set on the first PC.

On the 2nd PC, I disabled backup from the main Norton 360 panel. Will this disrupt the first PC's backup, or does this disable backing up only from the second PC?

Thank you.