https://techcrunch.com/2021/09/10/whatsapp-encrypt-cloud-backup/

WhatsApp said on Friday it will give its two billion users the option to encrypt their chat backups to the cloud, taking a significant step to put a lid on one of the tricky ways private communication between individuals on the app can be compromised.

The Facebook-owned service has end-to-end encrypted chats between users for more than a decade. But users have had no option but to store their chat backup to their cloud — iCloud on iPhones and Google Drive on Android — in an unencrypted format.