Hello,
I think is missing the option to “exclude directories and files” from the “Wordpress core” with the Updraftplus add-on.
see images:
in updraftplus premium:
https://i.imgur.com/gBo7Vfw.png
in mainwp
https://i.imgur.com/1xXdAu0.png
ps: At least for me, it is very important to include these files in backups, especially wp-config.php, in case I suffer an attack or problem and need to restore the entire website (including the modifications and customizations included in wp-config.php), but excluding other folders and files unrelated to the website that are also in the root directory.