Which GUI editor feature allows opening pages from the World Wide Web for saving to a local or remote system?

The import HTML pages feature is the correct choice because it specifically enables users to open and download existing web pages from the internet into the GUI editor. This feature typically allows users to retrieve entire HTML documents, which can then be edited locally within the editor environment.

When using an import function, users can access web resources directly and save the content to their local systems or prepare it for further manipulation. This functionality is crucial for web development as it allows designers and developers to leverage existing web content as templates or starting points for new projects.

In contrast, other options do not serve the same purpose. The export HTML pages feature pertains to saving local content to a web format, while the save as option is about naming and storing files locally. The backup feature focuses on creating copies of existing files for safety rather than retrieving web pages. Hence, for the specific action of opening web pages from the internet for use in a local or remote system, the import HTML pages feature is the most appropriate choice.