Server Cron ignore files

https://updraftplus.com/faqs/can-i-run-backups-from-the-shell/

Hi, I’m going to implement the code on the above page but I need a way to include all non WP files at root, and to ignore very large files in the theme.

Can you explain how I do this.

I have a paid account.

The page I need help with: [log in to see the link]