That said, GitHub wikis are just git repositories. You can clone them like this:
https://help.github.com/articles/adding-and-editing-wiki-pag...
As for issues, it's only a little bit trickier - you'll have to use GitHub API, like this:
https://api.github.com/repos/hotsh/rstat.us/issues (from https://www.quora.com/How-can-I-export-backup-GitHub-issues)
That said, GitHub wikis are just git repositories. You can clone them like this:
https://help.github.com/articles/adding-and-editing-wiki-pag...
As for issues, it's only a little bit trickier - you'll have to use GitHub API, like this:
https://api.github.com/repos/hotsh/rstat.us/issues (from https://www.quora.com/How-can-I-export-backup-GitHub-issues)