Google contacts.

, passwords,

Google app passwords.

> wifi settings,

Because you can't not use Google's app for it.

> browser settings,

Google Chrome settings.

> photos,

Google photos.

> etc.

(As long as it's in a Google app.)

> it's astonishing how quickly you can set up a new phone by simply logging into your Google account.

After ten years or so of using Android I finally bit the bullet and enabled Google backups to transfer stuff to my new phone a few months back, and I was astonished at how fucking nothing gets backed up that isn't already in a Google cloud synced app. What's the point? Every single other app I had to manually figure out how to transfer and restore, because all Google doing is to "helpfully" prevent me from backing up my data for "security" reasons.