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We are doing a large update on our website and

Is there a way to make a copy of the website, navbar and work on it for a while and then push it live. I would like to work on a copy as I want to do a lot of updates on the nav bar.

I have seen you can save versions but feel I may make a mistake and then have to go back and overwrite some good work.

Looking for something like a staging site but it would live behind the real site that is already created. I have searched and found what feels like a partial solutions but not what I am looking for.

IS there such a solution?