def has_conflicting_backup_with(self, remote_node_id: bytes):
        """ Returns whether we have an active channel with this node on another device, using same local node id. """
        channel_backup_peers = [
            cb.node_id for cb in self.channel_backups.values()
            if (not cb.is_closed() and cb.get_local_pubkey() == self.node_keypair.pubkey)]
        return any(remote_node_id.startswith(cb_peer_nodeid) for cb_peer_nodeid in channel_backup_peers)
 Returns whether we have an active channel with this node on another device, using same local node id. 
electrum/lnworker.py