CRONTAB:

Add the following line to crontab in order to enable backup

00 02 * * * /opt/siraserver/backupall.sh > /var/log/Backup.log 2>&1

or for demo server


00 02 * * * /opt/siraserver/demofiles/resetdemoserver.sh  > /dev/null 2>&1 

EMAIL:

In order to send backup status info from the system, an smtp client ist needed:

>apt install ssmtp

Configuration at /etc/ssmtp/ssmtp.conf and 
/etc/ssmtp/revaliases:
root@SIRAServer:smtp.example.de:465


