Is it possible to backup the proprietary Google Docs format?

Hi all,

I was wondering if any of you know how to backup Google Docs, Sheets, and Slides locally to a hard drive in their original, proprietary state? At the moment, it looks like the only thing you can do is backup a link to these and not the actual file. I want the files in the proprietary Google format, I do not want to convert it to .doc, .pdf, etc.