One line, for the user that owns the ITFlow files - crontab -e as them. On a hosting control panel such as Jabali, HestiaCP or cPanel, add it as a cron job that runs every minute. The install script adds it for you.
Cron ran .
Turn cron back on
Someone switched it off in Maintenance > Cron, and every job stops itself while it is off.
Nothing is emailed or backed up until cron runs - the other steps can be done meanwhile.