[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@remotehost:/var/www/html /backup/html   Thank you

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