if you disable message previews in the app, those messages are never decrypted and put into the notification stack, and can’t be backed up in icloud. Which should also be disabled. the security implications of turning on messages previews is pretty obvious, and they are also mentioned in the app. if you have message previews popping up on your lock screen of your terrorism plans, then you’re a fucking idiot. if you glamourize the massacre at waco texas, then you’re a fucking idiot (they really did). if you spend months planning a bombing and ZERO minutes planning opsec, then you’re a fucking idiot. either this whole thing is a fake terror plot manufactured by the government, or they’re fucking idiots… or maybe a nifty combination. Signal messenger provides bulletproof end to end encryption, but all pipes leak at both ends.