Before any major changes, it's always wise to generate a backup version of your site.
On the bottom toolbar, click Content > Structure, then click the vertical three-dot icon next to the New page button. From the dropdown menu that opens, select Download entire site.
You will be directed to your site download view, where you'll be able to initiate the backup. It usually takes a couple of minutes so feel free to leave the page — we will notify you via e-mail once the backup has been successfully generated.
To download the backup, simply click on the zip icon in the menu and you're good to go!