Even in that case, you could only backup on device storage, had to write down (!) a huge set of numbers and manually copy files around. The whole flow is awfully terrible to any user - at least WhatsApp can sync your profile over Google Drive.

Last time my phone died, I lost all of my Signal group memberships, because the app is incapable of transfering those to a new phone without backup... and it's also incapable of doing the backup automatically. Those UX choices continiously baffle me - it's like authors didn't learn anything from the failure of PGP.