https://www.boxcryptor.com/en/blog/post/iphone-backup-icloud-encryption/ https://www.boxcryptor.com/en/blog/post/iphone-backup-icloud... Though, it is possible

https://www.boxcryptor.com/en/blog/post/iphone-backup-icloud-encryption/ https://www.boxcryptor.com/en/blog/post/iphone-backup-icloud... Though, it is possible that WhatsApp is encrypting backups before uploading them to iCloud.