Aside from the usual setup stuff (do you want to setup backups?) or when opening applications that obviously require an account to function (Play Store, for exa

Aside from the usual setup stuff (do you want to setup backups?) or when opening applications that obviously require an account to function (Play Store, for example), I haven't had any nagging on Android. Never had an update delete all my data, either. That said, some of their stuff does require an account even when you think it isn't warranted, such as reading arbitrary PDFs through their Play Books app (though the Drive PDF reader works fine regardless).