About repository restoration
Usually, if someone deletes a repository, it will be available on disk for 90 days and can be restored via the site admin dashboard. For more information, see "Site admin dashboard."
Unless a legal hold is in effect on a user or organization, after 90 days the repository is purged and deleted forever.
If a repository was part of a fork network when it was deleted, the restored repository will be detached from the original fork network.
It can take up to an hour after a repository is deleted before that repository is available for restoration.
Restoring a repository will not restore release attachments or team permissions. Issues that are restored will not be labeled.
Restoring a deleted repository
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From an administrative account on GitHub Enterprise Server, in the upper-right corner of any page, click .  
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If you're not already on the "Site admin" page, in the upper-left corner, click Site admin.  
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In the search field, type the name of the user or organization and click Search.  
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In the search results, click the name of the user or organization.  
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In the Repositories section, click the Deleted repositories link. 
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Find the repository you want to restore in the deleted repositories list, then to the right of the repository name click Restore. 
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To confirm you would like to restore the named repository, click Restore.