Run force backup from terminal for WHM based server
To run force backup you need to connect to the server using ROOT login.
Once you have connected to your server, run the following command :
/usr/local/cpanel/bin/backup
You will receive output that backup has started at xx date time along with the location of it’s log file.
cPanel / WHM backup log file location :
/usr/local/cpanel/logs/cpbackup/
Make sure you have enabled backups prior to running this command (WHM >> Backup Configuration)