Time machine to make the backup of an external disk

Hi community
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.
thanks in advance.
regards
PD: if you think of a more efficient way to do it not based on Apple’s Time Machine, I’m all ears specially if it’s simple and user friendly.

Try a clone.
Clone - Carbon Copy Cloner (Often recommended as it has more features than some others)
Clone – Data Backup
Clone – Deja Vu
Clone - SuperDuper
Clone - Synk
Clone Software – 6 Applications Tested
Commonly Used Backup Methods

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Budget $1299.
http://www.apple.com/macbookair/
http://www.apple.com/macbookpro/
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Time machine to make the backup of an external disk

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