I'm looking to backup one of my terabyte hard drives to another one ( /dev/sda to /dev/sdb - well specifically a directory on sda that will contact a lot of important data). I've thought about using Acronis to create an image whenever I want to back it up, but I'd personally rather have it automated.

I was wondering if anyone has any suggestions on software to use to back it up where I could automate an incremental backup. I know there's a way to do it in the system using cron, but not sure how to do it making it incremental.

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Need a little more help, considering I'm new to writing shell scripts.

How do I get it to do incremental updates and is there a way to get it to delete incremental updates after say a week or so automatically so I'm not having to go in and delete old backups that aren't needed anymore?