Backup file too big using Disk Utility

I need to back up my 160GB Mackintosh HD on my imac OSX 10.6.3 (Snow Leopard) using disk utility. After a short period of the imaging process I get a message saying 'file too big'. What can I do to resolve the problem? My external drive is 1TB with 500GB available.
I've tried using Time Machine but this seems to want to wipe my external disk.

You may or may not be able to use the Disk Utility in the /Applications/Utilities/ folder to shrink the single partition and create a new one in the free space.
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    Lion and Mountain Lion create local snapshots on MacBooks, MacBooks Air and MacBooks Pro with Time Machine activated > http://pondini.org/TM/30.html
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    =============================
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    Message was edited by: Carolyn Samit

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