Backing up external hdds using Automator...?

I have 2 external hdds: hdd 1 is 250gb and hdd 2 is 500gbs. I want hdd 2 to backup hdd 1. Every change on hdd 1 is copied over to hdd 2, but I don't want changes in hdd 2 to be carried to hdd 1. How can I set this up on Automator?

Rsync is your friend here. It is a program accessible through the Terinal which can synchronize disk2 to to disk1.
you can write a short shell script to have rsync syncronize the disks, then have Cron run the script on a schedule of, say, every 30 minutes.
If you are not used to the Terminal, this sounds much more complicated than it is and you can post in [the Unix forum|http://discussions.apple.com/forum.jspa?forumID=735] if you need more help.
hth,
b.

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