Can i use a external thunderbolt harddrive to copy my imac hard drive.

how fast would a thunderbolt external hard drive be, if i were to copy my Imac hard drive as a backup or image. At the moment its taking 4 hours to copy 95gig using my USB external hard drive......Seems like forever!!!!!

http://support.apple.com/kb/HT1948?viewlocale=en_US&locale=en_US
Visit that link. It seems you should be able to but you would have to format the drive and install the operating system to it.
On the iMac, start it up and immeditely hold down Command + R.  From there you can open disk utility and format it.

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