WhatsApp has billions of users, so how they manage to store all of our chats. Hmm, interesting. So first of all, they are not storing your chats. You are storing the chats. WhatsApp does not have a giant database for your messages in their data center. When you send a message, it’s encrypted on your phone, it passes through the server, and later on is delivered. Once it is on the other phone, WhatsApp delete it from their system. This is why when you switch phone without a backup, your chats are gone because WhatsApp cannot restore them because they never had them in the first place. This is a core of end-to-end encryption. This is not just privacy, it’s a brilliant architectural move that saves them petabytes of storage cost. So WhatsApp built a billion-dollar empire by making the user infrastructure simple.
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