You can easily delete a website backup from within your cPanel account with Softaculous. To delete a website backup:

1. Log in to your cPanel dashboard
2. Click Softaculous in the Software/Services section
   
   
   
   
3. Click the Backup icon located in the top right-hand corner of your screen
   
   
   
   
4. Click the red 'X' icon to the right of the backup you would like to delete

You're done!