[CentOS] rsync

Hi
 
I put the rsync in cronjob
but it won't work
 
in root user cron
 
*/30  * * * *  /home/chloe/rsy.sh >/dev/null 2>&1
 
1/ why it needs pw when I run this rsy.sh in root?
but if I run it in chloe user, it doesn't need pw as I put authoized_key in remote host chloe 
 
2/ why this root cronjob is not working? what wrong? I can't see this cron in message
 
the rsy.sh is below
 
#! /bin/sh
rsync -essh -av chloe at remotehost:/var/www/html /backup/html
 
Thank you


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