You don't. Google backup is partial and very limited compared to what apple does, plus privacy issues and you don't get access to app folder without root. (I know about adb but then you can't push the files back there).

So it's a shitshow as usual with Android, it all depends on the app. My weight lifting app it can backup on Google cloud. Great. My 2Fa on the other hand it only backup to the 'external' storage, need to transfer it to the computer then. Some app don't have backup option. Some app give backup option but then break when you restore it, like moon reader. Some books just disappeared from the backup.

And so on, and so on.

At the end I focus on photo, obsidian vault and 2fa. Everything else is just bonus if I backed it up.