While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called content delivery networks to manage data and distribution.

虽然你的个人电脑只能保存一个文件的一个副本，但像 Facebook 这样的大型服务项目，则会依赖于所谓的内容分发网络来管理数据和分发。

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The content of each file is a single customer data record.

每个文件的内容都是单个客户数据记录。

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That data might be previously cached content, or locally stored data in the form of XML or other file formats.

这些数据可以是之前缓存好的内容，也可以是以XML或其他文件格式存储的数据。

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The moral of this story is that information hoarding in order to leverage Big Data tools may work in the structured data world, but will not work in the broader information world that includes unstructured content (the Word file, PowerPoint presentations, CAD files, audio files, and other large data types that dominate corporate information stores).

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Since the folder to store data is locked and unlocked just like a safety box, many kinds of content file formats such as private photos, videos, memo pads, or other documents can be protected.

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