FWIW, powerquest solved this problem in DriveImage 7 on the windows platform. It essentially involves taking a "snapshot" of the drive. It allowed them to perform hot backups without having to boot to dos. THe technology was good enough it induced symantec to buy them out so it could be incorporated into Ghost. There used to be a white paper on the technology on the powerquest website, I don't know if it was transferred to the symantec site. Whether this technology is possible for the macintosh I do not know
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