Old External Drive failing; want to clone it to new external drive

I have an iMac connected to an external hard drive that is showing signs of age, and I fear that it may be failing. I'm going to replace it today.
The external drive has 2 partitions: one for Time Machine, and another for what just refer to as "Extended Storage." I put my video files and the like there so as not to eat up space on my iMac's drive.
My new drive will be 750GB. Before I do anything else, I want to effectively clone everything on the current external drive to the new one. Having never done this before, I may be asking a dumb/easy question, but can someone guide me on how to go about doing this?
Also, if anyone has thoughts/suggestions on how I should go about partitioning the new drive, I would welcome them. For what it's worth, my iMac's internal drive is 160GB, and the current external drive is 400GB, which is split up 160 GB to Time Machine, and the rest to extended storage.
Thank you for any guidance you can provide.

Hi! HERE is some formatting info. HERE is SuperDuper, HERE is CarbonCopyCloner, HERE are the instructions for using the Apple Disk Utility and HERE is additional backup info. Tom
Message was edited by: Thomas Bryant

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