http://bugs.winehq.org/show_bug.cgi?id=15199
--- Comment #6 from Vitaliy Margolen vitaliy@kievinfo.com 2008-09-09 13:24:49 --- Wine is not windows. It is still running on *NIX. And you can still access all the files regardless of what "system" thinks you should.
Because Wine is not VM there is no way (nor there will) to make the same type of snapshot (with applications running). So the only option left - copy of all the environment (files and registry). And that can easily be done by backing up ~/.wine (or more correctly $WINEPREFIX).