Limit the number of the backups copy for customer

Dear,
the backup utility for website and database is very useful. But at this time this feature allow every customer to create 10X retain of backup of their website. This means a lot of space (also if mounted on different storage).
It's there a way to limit the number of backup retains, on customer limits?

Let us know.
Thank you.

 

Can i override from database the setting of the user, right? With a query like that:

update web_domain set backup_copies=3 where backup_copies>3;

 

in a master-slave setup, i must run this query only on the master or both master and slave?