How do I make a backup of an external disk?

I have an external disk that is formatted in Mac Extended Journal on which I keep movie files and photos.
I had some bad experiences in the past with my first MacBook Air (version 2.1) in which external drives kept getting erased without any good reason. I think it's due to the fact that I had to connect a USB cord to another computer when I had an external drive plugged into the MBA because the MBA could not power it on its own.
I thought it was due to a bad external drive and I took it to Samsung service center and complained that their drive was malfunctioning. I got a refund. But later on, I found that the same thing happened to another external drive and to a USB flash drive, so I realized that it had nothing to do with the external disks and something to do with the computer. I used the same drives that got erased on a newer MacBook Air (version 3.2) and I never had the sudden erasure problem.
Anyhow that's the background to why I want to make a clone of the external disks in my possession. If for some reason, the external disk gets suddenly erased, I would like a copy somewhere in safekeeping so that I do not lose all my movies.
How do I make a clone of an external disk?
I will be using a MacBook Air (3.2) for this task. It has two USB ports. Can I use Carbon Copy Cloner to do this? Just choose a source disk (external disk I want to clone) and a destination disk (the external disk where I want it to be cloned to)?

Many backup utilities like Carbon Copy Cloner and Super Duper can be used to clone drives. They can also clone boot drive to make bootable clones. They use "smart" backups in that they only update what has been changed from the previous backup. That is what you need too since you intend to use USB which is not that fast.
With CCC you can set up a task to start the backup automatically when you plug the backup in and it mounts.
FWIW I use CCC to make daily backups of my disks (scheduled backups can be done by these utilities).

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I’m using time machine to make backups of my Mac as many people do, but now I’d like to know how can I use it to backup on a different time machine disk, the content of an external disk. don’t know if I’m clear enough, that’s a complex question and my english is what it is.
I will reformulate just in case. I have a 1Tb external disk that I want to backup from time to time. So the idea was to plug that disk on my MacbookPro, plug a 2Tb disk that I would use as backup or time machine disk (not the usual one that I’m using for backing up my Mac), and that the Mac will automatically backup one to the other.
right now I’m making security copies every 3 months just by copying the whole content of the first disk to the 2nd one, but it takes 24 hours to do it, and since the content to be copied, does not change a lot, I think that backup program will improve it quite a lot.
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== Issue
==
I have a problem with my bookmarks, cookies, history or settings
== Description
==
How can I make a backup listing of all of my Firefox bookmarks, with completely written out URLs, so I can print it out from a word processing document? Please email me the answer-
[email protected]
<blockquote>duplicate. Locked. Please continue [https://support.mozilla.com/en-US/forum/1/727213 here] -MJB</blockquote>
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== Operating system
==
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==
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==
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