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Our team uses Google Code project hosting as our svn repository. This can be a problem during competition when one doesn't have access to the internet though. A simple solution is to just work off one communal laptop to do all the programming. We haven't run into a situation where that computer has broken down on us in the middle of comp; however, we do have backup laptops that contain code from the previous day/night commit to the repository.

Surprised nobody has said anything like using an external hard drive to store the repository. Now that I think about it, you could also do all your work off an external hard drive or a usb drive (sorta mentioned above).