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With Google One, you can make a full backup and restore.
But... it's not absolutely total, it doesn't include some local data files some older apps may have created.
You do kinda need a 2nd device to do these things confidently.
I still effed up and lost all my WhatsApp history though... so even with my careful planning things went to shit.
Signal was wonderful though, full wireless transfer of chat history from one device to another.
Interesting cheers. Looks a lot different than when I last rooted a phone and loads of stuff refused to work. I'd be keen to see if it improved the battery life for my Pixel 6 but the inability (so far as I'm aware) to just make a full backup and restore everyything to what it currently is if things don't work make me suspect I may not get round to it.