One of the biggest fears of any IT manager about cloud computing is the lack of openness. In other words, they ask, “How easy is it to get in and out? Or they might ask, “How portable is a cloud application?”
Ideally, enterprises should be able to take applications and data in or out of a cloud as business requires without having to rewrite the application or transform the data.
As discussed in the article “Don’t Get Stuck in a Cloud ,” cloud portability tends to be a factor related to the type of cloud one uses.
Here is a quick portability analysis of the three big Clouds on the market: