I'm just trying it out and it seems not, iOS doesn't expose the photos folder to the app.
My workaround for this has been to install iCloud on a Windows machine which then downloads all the photos from my phone, and Syncthing on Windows monitors the iCloud folder and shares it with a Linux machine that does my backups. A bit convoluted but it works.
My workaround for this has been to install iCloud on a Windows machine which then downloads all the photos from my phone, and Syncthing on Windows monitors the iCloud folder and shares it with a Linux machine that does my backups. A bit convoluted but it works.