What I would do is configure a laptop to run DRBL or Windows Deployment Services (WDS). Both will give you PXE boot options and can boot whatever Linux (DRBL) or WinPE (WDS) utilities you want to use. WDS is a part of Windows Server 2008 R2 and for what you are going to need it for, you shouldn't have to purchase a license since the evaluation period should be sufficient time for you to complete your process. My suggestion would be to customize a Windows PE image to run a backup utility to capture all the data and write it to wherever you are putting it at, then run Gdisk32, which is a part of Norton Ghost to wipe the drive once the backup is complete and verified. You should be able to script this so it runs automatically once the PXE boot completes off a WDS server. I'm sure there's a way to do the same thing with DBAN if you're going to use DRBL instead.