Steegle.One Intranet for Google Workspace
For new Google Sites see these instructions: Copy Pages - new Google Sites
Navigate to the page you wish to copy;
Use the More button then Copy page (or use the keyboard shortcut Shift+c);
Enter a name for your copied page in the Name your page: box and Select a location for the copied page;
Use the red Copy button at the towards the top of the page to start the page copy process;
Once copied Google Sites will take you to the copied page and open the editor so you can make any necessary changes.