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Does it work phone to phone? I was under the impression that a backup restore was needed if you wanted previous messages. It’s really an unnecessary security risk to have previous message sync. Someone gets your phone in their hand for 20 seconds, links your device and they get every message you have ever sent? No bueno.
You can sync messages from phone to phone. https://support.signal.org/hc/en-us/articles/360007059752-Backup-and-Restore-Messages#android_transfer