Scheduled Task - Permission denied

[JohnnyU]

Cloud VPS
OS - CentOS 6.5 (Final)
Panel - 11.5.30 Update #42

1. In Plesk i`ve setup a cronjob to backup a mysql database (tested from ssh - root and working):

mysqldump -uadmin -p`cat /etc/psa/.psa.shadow` MYDB > /var/www/vhosts/MYSITE.com/httpdocs/bk/backup_`date +\%d.\%m.\%Y`.sql

2. first i ran:

/usr/local/psa/bin/server_pref -u -crontab-secure-shell "/bin/sh"

3. then i executed the cronjob and received email:

cat: /etc/psa/.psa.shadow: Permission denied
/bin/sh: /var/www/vhosts/MYSITE.com/httpdocs/bk/backup_21.04.2014.sql: Permission denied

4. and for another cronjob to delete older backups:

find /var/www/vhosts/MYSITE.com/httpdocs/bk -mtime +20 -type f -exec rm {} \;

similar error:

rm: cannot remove `/var/www/vhosts/MYSITE.com/httpdocs/bk/backup.08.02.2014.sql': Permission denied