Not appear dailly backups

I ran daily backups on WHM, but lost some backups. I think it's faulty but I can't check the cause I check log error in /usr/local/cpanel/error_logs and only saw:" 2021-05-19 02:00:02 +0700] info [backup] A backup process (ID: 885253) is already running." Checking in /usr/local/cpanel/logs/cpbackup/1621191601.log saw daily backup log of 17/05/2021