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This isn’t just some remote, not-gonna-happen possibility. It does happen, as a lot of Nirvanex customers learned earlier this year. Essentially, you need to plan for it almost the same way as disaster recovery. There was a good article about this in Networkworld earlier this year. One of the most effective and easiest things you can do to avoid a scenario where a cloud provider goes belly up is to choose the provider carefully. Google, Amazon, IBM...companies that are large and established are far less likely to suddenly go out of business than some small, undercapitalized business.
If you want to read the entire article, here is a link to it.