You can force backups to run by running the following command as root:
/usr/local/cpanel/bin/backup --force
Check Diskspace
[10:35:41 cp-01 root@94768848 ~]cPs# grep -i 'available disk space' /usr/local/cpanel/logs/cpbackup/*
/usr/local/cpanel/logs/cpbackup/1677942002.log:[2023-03-05 02:39:46 +1100] warn [backup] Available disk space (4 percent) is too low. Backups will not run.
This error is due to the disk space on your server being less than the 5% threshold you have set in the Backup Configuration:
[10:27:16 cp-01 root@94768848 ~]cPs# grep -i 'min' /var/cpanel/backups/config
CHECK_MIN_FREE_SPACE: 1
MIN_FREE_SPACE: 5
MIN_FREE_SPACE_UNIT: percent
More information on this error can be found in the following article: