What if cPanel/WHM server regular/daily backups are not made? How to fix?

What are steps to do to discover why regular backups on WHM/cPanel server stopped being created?

Backups are enabled in WHM / Backup / Backup configuration

But if suddenly stopped being made you may try:

1) check if all partitions have enough disk space and are not full. I do it from within command line by command: df -h

2) make sure there are no hanged processes of the backup, (linux command: ps auxf | grep back). If there are hanging some backup processes, kill them by command: kill -9 PID

is crond service running? service crond status;service crond restart