How to Use Backup User Selection Interface?
Overview
You can exclude cPanel accounts from scheduled backups using the Backup User Selection interface.
Backup user selection

1] Login to the WHM control panel with root access.
2] Click on the Backup option from the navigation menu.

3] Now, click on Backup User Selection.

4] Backup User Selection window will appear on the screen.

5] Go to Account Actions drops down, pick the appropriate option to enable or disable all cPanel account backups.
6] You may also enable or disable backups for particular users.

When you configure a backup in WHM’s Backup Configuration, your backups automatically contain user account information. Using this new functionality, you may adjust this setting.
Legacy backups
If your system still has legacy backups, the Legacy column will show up on the Backup User Selection page. When using traditional backups, cPanel accounts will have the Enable toggle activated by default. In a cPanel account, legacy and account backups can both be enabled simultaneously.
If you want to stop a cPanel account from using legacy backups, set the Enable option to Disable.
Please keep in mind that blocking a cPanel user from using legacy backups simply stops them from making new legacy backups. To convert all of your system’s traditional backups to account backups, use the Backup System Migration interface.