October 15, 2018
As first announced July 18, Google has an automatic migration tool to transfer from Google classic Sites to new Sites. Although Google has not yet announced a date to end classic Sites, we strongly encourage you to begin converting your classic Sites. This will help avoid a last minute rush and possible loss of your Sites content. A new Site can either be published to the URL of the classic Site (replacing it) or published to a new URL.
You can use the Help Center to find out more about how to convert a classic Site to a new Site and what to expect when you convert a site.