Duplicate Site

There no version history in New Sites, but "Version history so you can see and restore previous versions" has been promised..

You can make a backup copy of your site. I recommend doing that to prevent accidental loss of site data.

You can find your site in Google Drive and make a copy, but this only works for smaller sites. The best way is to click the 3-dot more icon and select Duplicate site.

Read More (From Steegle)