Anyway, 1Samildanach nailed it, just create a live CD and you'll be able to back up straight from there. I'm partial to http://puppylinux.org/main/Download%20Latest%20Release.htm for this job as it's small so it boots into the live mode really fast, unlike heavier distros which may take longer to offload to memory
That's a good point. Last time I played with Puppy was... multiple years ago

, so it wasn't at the forefront of my mind (and I'm not up to date on how it is to use). I keep a RIP CD around for when something needs un-screwing, but I figured that'd be excessive for this situation in both power and complexity, so I suggested something that focuses on ease of use

.
None of this is particularly relevant to FFTW's problem, but I figure it doesn't hurt for him to understand why we suggested different things.
EDIT: Mint
might include special drivers that Puppy doesn't. Puppy aims to be easy to use and lightweight, Mint aims for easy to use and 'just works'.