Microsoft stated sometime last year that Regback could miss certain registry
files and was not an adequate backup tool in all cases. The following artcle
is  about their recommended method for registry backup.
http://support.microsoft.com/support/kb/articles/q132/3/32.asp?FR=0
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To that end I recommend a small DOS utility that runs out of Win95 or
Win98 called *Regback*

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