Apparently in FB Messenger, conversations will still be stored in the cloud, albeit encrypted: > Messenger has always allowed clients to operate off of a small

Apparently in FB Messenger, conversations will still be stored in the cloud, albeit encrypted: > Messenger has always allowed clients to operate off of a small stored local cache, relying on a server-side database for their message history. Neither WhatsApp nor Secret Conversations operated in this manner, and we didn’t want all users to have to rely on a device-side storage system. Instead, we designed an entirely new encrypted storage system called Labyrinth, with ciphertexts uploaded to our servers and loaded on-demand by clients, while operating in a multi-device manner and supporting key rotation when clients are removed.