Moving to cloud means that both applications and data must migrate to the cloud. Application and data migrations are two different things, and the needs and feasibility of each migration. For example, when considering data migration, the amount and types of data to move can affect decisions for migration. It’s also important to consider how stored data will integrate with the cloud application.
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http://www.informationweek.com/cloud/cloud-migrations-dont-forget-about-the-data/d/d-id/1112178?