By default, all public repositories are included in the GitHub Archive Program, a partnership between GitHub and organizations such as Software Heritage Foundation and Internet Archive to ensure the long-term preservation of the world's open source software. For more information, see "About archiving content and data on GitHub."
If you opt out of the GitHub Archive Program for a repository, the repository will be excluded from any long-term archives that GitHub may create in the future.
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On GitHub, navigate to the main page of the repository.
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Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.
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Under "Features", select or deselect Preserve this repository.