"Authentication error", making disk image

I'm trying to make a disk image of my OS X boot disk, as an emergency backup. I'm booting from the Installation CD that came with my Mac Pro, and using Disk Utility. I select my boot drive, click New Image, and tell it to save to an external firewire drive, compressed and encrypted. It starts and quickly errors out, with "Authentication error." What does this mean?
I've used 250 GB of the 500 GB on my boot drive, and my external drive is 120 GB. I'd rather tell it to skip some files to save space, but it doesn't give me the option to do that. Will "compress" get it to be small enough? Is this why I'm getting an error? I've repaired permissions before booting from the CD.

I don't know about the authentication error; however, to make a disk image of 250 GB source drive to a 120 GB target is an exercise in futility. There's not enough room. 250 GB? What are storing? A complete music store, the movies of Hollywood, or the pictures in an art gallery?
If you want an emergency backup of your 500 GB HD, then you'll need an external at least as big. BTW, making disk images for this purpose is fraught with danger since you can't ensure that it's good until you restore it to a bootable HD. I strongly recommend something like Carbon Copy Cloner, SuperDuper!, etc. instead. BTW, you can just drag & drop any data files from one HD to another. There's no need to put them in a disk image and certainly no need to encrypt things. If you decide to go the bootable backup route, move the data files to root-level and don't back those up. That should make your emergency backup a lot smaller.

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    Message was edited by: kryzma

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