Where is your eCommerce data saved? How is your data being used? Is your data protected by Data Privacy laws??

Few questions every consumer should ask

1. Where does the e-commerce transaction data & consumers personal data get stored? Does it get stored in India, in USA or some country that provides cheaper storage? How about China or Pakistan? 
2. How is your data being used by the service providers like Mastercard, Visa, Amazon, PayTM? Are these companies sharing insights from your data with other companies?
3. Can Indian governments monitor Data Usage if data is stored in another country? Can government enforce its Data Privacy law when eCommerce companies store data is another country?
4. What happens to your Personal Data in case of hostile situation with the country in which your data is stored?