Mastodawn

End-to-End Encryption is good but metadata protection counts as much. Names, group descriptions and memberships, avatars, who talks to whom ...

Both #deltachat and #signal go to great length to protect all the metadata that WhatsApp grants itself gratuitously. #Matrix stores similar scales of metadata on their servers, even if you can choose which server stores it.

Everything is better than #Telegram which additionally stores message contents in all group chats/channels and most 1:1 chats.

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Raiden

@delta
Actually, WhatsApp offers the option to encrypt backups, and Apple offers the option to encrypt iCloud. However, not all users will take advantage of this, so its usefulness is limited.

Personally, I hope that DC-iOS will one day get iCloud backup support. Provided it is not too complicated to implement. In my opinion, it makes more sense than before, since chatmail servers only temporarily store emails.