Labyrinth 1.1: Making End-to-End Encrypted Backups Even More Reliable

What this post added

Introduces Labyrinth 1.1, a new sub-protocol for Messenger's end-to-end encrypted backups. This version enhances reliability by enabling messages to be backed up as they are sent, rather than waiting for the device to come online. This addresses scenarios like device loss, device switching, and long gaps between sign-ins, ensuring message history is preserved and restorable.