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Secret chats are e2e-encrypted chats that never under any circumstances get backed up. Cloud chats are encrypted in the same way, but also have a built-in cloud backup. Cloud chats are designed for the majority of users – the majority that in another app like WhatsApp would rely on less secure third-party backup storage. Unlike what you have in niche apps, the traffic between cloud chat users and secret chat users on Telegram is mixed (the encryption is the same in both cases, but in cloud chats our servers do have access to the encryption key), so individuals can not be singled out and targeted based on the fact that they use secret chats and thus have something to hide.