Created guide for docker save command. (#18785)
* Created guide for docker save command. * Updated subheading for consistency.pull/19313/head
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title: Docker save
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## Docker save
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`docker save` stores a Docker image to a tar archive. It is useful to make an offline backup of an image or transfer an image to a computer in a corporate environment which does not have a direct access to the Internet.
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For example, to save the nginx image already in local computer to a file named `nginx-backup.tar`, the following command can be run:
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```
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docker save -o nginx-backup.tar nginx
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```
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Or with a specific version:
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```
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docker save -o nginx-backup.tar nginx:1.15.5
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```
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#### More Information:
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- [Docker CLI docs: save](https://docs.docker.com/engine/reference/commandline/save/)
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