How data is stored using Cloud Storage
Once people understand the basics of cloud storage a common questions is “which part of the cloud has my data and how does it get to me?” There’s not necessarily one answer. A number of factors such as the size of your data and the technologies being used to manage the logical storage pool the cloud is using may determine exactly where your data is stored. It’s possible your data is on a single storage device somewhere. It’s almost equally possible that your data is split up into multiple pieces across multiple storage devices around the world.
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“La nube informática” by Sam Johnston