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In most cases the more servers you have the less likely that everything will completely die and fail, but at the same time that also means 4 times the administrative work.
If you have a good managed host that takes care of these issues for you and each server more or less mirrors the others, at least in the core daemons, versions, etc, then 4 servers is a good route.
Honestly it all comes down to you and your host, if you got good managed service you can just have them review your current layout and make any necessary changes, whether that be to consolidate, or distribute.
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Take Luck!
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