I'm not going to trust google with that after a decade of terrible track record.
I don't believe one second there is a way to opt out of Google tracking you. At best, you can lower the settings on how much it displays the informations it has on you.
I personally don't think that Google spend money to store your data if they aren't actively using it, though I can understand the sentiment. That said, you might as well switch it off if privacy is something you care about.
