IMac will not start-up, do not have a backup, any way to back it up before erasing the drive?

Our iMac will not start up, it goes to the flashing question mark screen. I have tried the different steps listed at http://support.apple.com/kb/TS1440, but they have not worked, as it says the disk is not repairable. It says I need to erase the disk and reinstall OS X. However, I do not currently have a back-up of the hard drive, so is there any way I can back it up before erasing and reinstalling, even though the iMac will not start up? Thanks.

I also tried downloading Snow Leopard onto an external hard drive and boot from there, but it just comes up to the choose a language screen everytime.

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