Usually, if someone deletes a repository, it will be available on disk for 90 days and can be restored via the site admin dashboard. After 90 days the repository is purged and deleted forever. If you place a legal hold on a user or organization, repositories they own are available for restore indefinitely.
- Sign in to your GitHub Enterprise Server instance at 
http(s)://HOSTNAME/login. - From an administrative account on GitHub Enterprise Server, click  in the upper-right corner of any page.

 - In the search field, type the name of the user or organization and click Search.

 - In the search results, click the name of the user or organization.

 - In the upper-right corner of the page, click  Admin.

 - In the left sidebar, click Admin.

 - Click Place legal hold.
