There are a number of forum posts and wiki articles regarding Zimbra Disaster Recovery and Moving Zimbra to a New Server that will explain all of your options.
We personally prefer the "install.sh -s" method as it seems to minimize downtime and works the same with both FOSS and NE editions.
Hope that gets you started; feel free to post back if you have specific questions.
All the best,
Mark
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___________________________________ L. Mark Stone, CIO "Uptime. All the time."
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