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I move servers everday, the way some people change underwear, to load balance, accomodate new business, etc.
Secret is to clone the new server with rsync, and test it. Then switch your nameservers.
It helps to first lower the TTL in your current DNS to 5 minutes or something, otherwise you end up with both hosts being live for a day or two in caches, not a big problem but you end up with new joins and members getting assigned to one server or the other.
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