How can I back up or duplicate my Wix site ?
To duplicate your site: Sign in to your Wix account > click My Sites > next to the relevant site, click Manage Site > on the right, under Website Actions > click Duplicate Site (you might need to click Show More to see this option).
Note: You don't need to worry about losing your site content! You can find an overview of all edits and changes that you have made to your saved and published site in your Site History. This makes it easy for you to view, flag or restore to a prior version of your site at any point.