Need help with centos backup script

Need help with centos backup script

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Job Description

I have 3 webservers. 2 production and 1 backup.
I have backups running on the 2 production, but would like a daily rsync script setup to the backup server.
I'm stuck on creating the ssh key so I would not have to enter the password when I run my rsync command.
Probably something really stupid I'm missing.
Thanks,

Mark