https://blog.faceutil.com/2017/04/06/%eb%a0%88%ec%a7%80%ec%8a%a4%ed%8a%b8%eb%a6%ac-%ec%83%81%ed%83%9c%eb%b9%84%ea%b5%90-taking-a-snapshot-of-your-registry-%e3%83%b1/