HT1553 how do you keep imac from going to sleep during disk utility backup ?

using the install DVD I am attempting to create a disk image backup with the Disk Utility app. However the imac goes to slepp every 10 minutes. eventually causing an error.
I found the commands to use on the commandline in terminal, However I can not use terminal and Disk Utility app at the same time from the install DVD.
I am using moutian lion install usb drive.
The Snow Leopard install DVD could not handle the 3 TB enternal harddive where the backup will be placed, before I do a clean install of Mountain Lion.

this seems to be an issue in (mountain lion?) disk util - actually the second bug that I know of now.
I am having the same issue whilst using zeroDIsk - however the system going to standy seems to slow the task down, it hasn't failed yet.
From what I can see caffeinate will solve the issue (in mountain lion)
https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/ man8/caffeinate.8.html

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<blockquote>Locked by Moderator as a duplicate/re-post.
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It goes to "off line mode" can I keep it from doing that?
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I did deselect and disable those phishing and malware updates to see if they were the issue. I was trying to experiment, if it would still call back to Google.
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HT1553 how do you keep imac from going to sleep during disk utility backup ?

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