mysql - database backup with cron jobs in cpanel -

i trying take in cpanel using cron jobs.

my script this

/usr/bin/mysqldump --user=username --password=password --host=localhost dbname | gzip > /home/username/backups/dbbackup_$date.sql.gz 

and in backup.sh

#!/bin/bash date=`date +%y%m%d_%k%m`;   /usr/bin/mysqldump --user=username --password=password --host=localhost dbname | gzip > /home/username/backups/dbbackup_$date.sql.gz 

and have set time every 5 mins. not happening. please suggest me doing wrong

can give exact line of cron job? tried this:

date=`date +%y%m%d_%k%m`     mysqldump -uroot -p12345 -h127.0.0.1 db | gzip > /home/ubuntu/root/db_$date.sql.gz 

and worked me, may there problem cron!!
to run every 5 minutes syntax:

*/5 * * * * sh /home/ubuntu/root/backupscript.sh