[Koha] Back up cronjob

[MARC FELIX]

Hi all, my previous problem has worked after i have created a new script to do indexing. I am however having problems with bachup.sh script. its is nor running automatically as i have configured it. Its is however running on the terminal and in webmin when i click 'Run now'. I have configured it as 

30 15 * * * /usr/share/koha/bin/cronjobs/backup.sh . Kindly assist