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Okular wrote: I couldn't find any post exactly related to this question: Is there any way of backing up your current site settings to restore them if you want to continue working on it and try out other layouts/styles?

You can't do that directly from the control panel, but you can easily create backups of config/config.user.json for example by FTP. Simply create a copy of the current file (current settings), and call it config.user.DATE.json (or whatever you like). The config.user.json file contains all your global settings including styles. It does NOT include page-specific settings.