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Bookmark or Share- “Back to” vs “Back in”? - English Language Learners Stack ExchangeYour ngram is irrelevant, because it ignores context. As Andrew says in a comment, we use back to 1990 only when there is a (metaphorical) notion of moving back in time.. So we can say this picture goes back to 1990, but if we are not using that metaphor, we have to say in: this picture was in 1990 or this picture was taken in 1990, or this picture is of me in 1990, or this is back in 1990.
- Back in Definition & Meaning - Merriam-Websterback in: [intransitive verb] to bet after having passed at the first opportunity.
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