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I am attempting to help a friend with a WordPress site I am in web development full time, but just trying to update PHP is presenting challenges. I am trying to be safe and back up the database or just clone everything prior to updating versions to be safe and not corrupt the db and for free.
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Just copy and pasta (clone) it
So you just need to update PHP? What hosting are they using? Every hosting platform that uses Cpanel, Plesk, etc makes that very easy. If you only have SSH access, then you just need to Google the required command. You haven’t really given enough info for us to offer any actual help.
You can’t damage a website’s code or corrupt it’s database by updating PHP – they’re completely unrelated/separate systems. That said, common sense dictates that they’d be backing up, daily, to a remote location already 😉