Copying a backup from one external drive to another automatically

[Awsomesauce]

Hello there......I finally got all my photos off my internal hd and onto an external drive.   I upload new pics to the external and work on them from there also.  My goal is to have a backup.   I have another external drive.  I would like to know how to automate the backing up of the photos file from one ext hd to the other.   Thank you.  

[Brian]

The only program that I know of that will automatically do it for you is "SuperDuper."

SuperDuper

You can give it a test drive by copying one HD to another for free, but if you want to schedule that feature, you'll need to pony up the $28 to have it turned on.

[Awsomesauce]

Thanks so much I'll try it?