You can save any static page as draft from the save menu in the Page settings.
Saving a page as draft in the Editor
You and any Collaborators can also save any static page as a draft in the Editor.
Need to know
If you save previously published pages as draft, they will be unpublished from your site the next time you publish your project. Any links to these pages will be broken. To redirect these pages, change the slug of that drafted page to something else like pagename-old. Then, redirect the old page by setting a 301 redirect. Learn how to set 301 redirects.
Staging drafted pages for publish
If you decide to publish a page that’s set as a draft, simply stage it for publish from the Page settings. Any page staged for publish will be published the next time you publish your entire project.
Best practices - creating a page backup
If you want to create a new version of a page. You’ll either create a new page and start from scratch or duplicate the existing page and edit it there. You can save this new page as a draft until it’s ready to be published and replace the old page.
Now, when the new page is ready, you’d want to do:
Rename the old page (optional) — ex. About-old, Contact-3, etc..
Rename the old page’s slug (recommended) — ex. about-old, contact-3, etc.
Save the old page as draft
Rename the new page (optional)
Rename the slug of the new page to preserve your links and SEO — ex. Rename about-wip to about.
Stage the page to publish
Publish your project
Slugs of drafted pages won’t be available when creating new pages. So, if you intend to use the same slug for a new page, make sure to rename the slug of the drafted page first.
Good to know
You cannot save a homepage as draft and you cannot set a drafted page as a homepage