If you do this for a living, always have a business continuity plan
1 - know how long you can afford to be down
2 - know how to recover your site on the same host
3 - know how to recover your sites on a different host
4 - practice it once in a while
5 - ALWAYS keep a backup "off site" - be it at home or a different host.
If possible, script your DNS changes, so you can point it to a different IP within hours.
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