Before making changes to any Drupal web site, we recommend making a local copy of your site for reference purposes.
From the menu, click on File "Save Page" (Or alternatively, press Ctrl+S).
The Save As dialog window appears. Select Web Page, complete in the Save as type dropdown.
The webpage is saved as a set of HTML file and a folder that holds the other elements of the page.
Chrome also has a Save as option. You can access it from the Page icon that's next to the address bar. You can also load the webpage and right click anywhere on the page to get to the context menu. Or do the quick keyboard thing with a press on Ctrl+S.
The same kind of Save As dialog window appears and lets you save the page as Web Page, complete in a location of your choice.