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Data at rest refers to all data in computer storage. Examples of this include corporate files stored on the hard drive of an employee’s computer, copies of the file stored in backup tapes on-site and off-site, files on the servers of a storage area network (SAN) and representations of the document in the computer’s display buffers.
Meanwhile, data in motion refers to the transfer of that data between all these copies and versions of the original file, such as data traversing the Internet.
Yet differentiating between how to secure data at rest and in motion is spurious. Generally, data requires a blend of protective measures. It is vitally important to consider data in motion and data at rest, just as it is important to consider where that data is replicated (and who is controlling its protection) – both inside and outside an organisation. Protective measures should be directed where they are needed most and in proportion to business risk levels.
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