How to disable backups for a cPanel user

I want to exclude a single user from backups. How can I disable backups for a cPanel user using the WHM interface or the command line?

Procedure

Via WHM

Log into WHM.

Navigate to Backup User Selection.

Enable or disable backups for the desired users.

Via Command-Line

To disable backups for a single user via the command-line, use the modifyacct API:

whmapi1 modifyacct user=example backup=0

Resources

Backup User Selection interface (cPanel Docs)

modifyacct (cPanel API Docs)