code: func (s *DefaultStorageFactory) Backends() []Backend {
  	servers := sets.NewString(s.StorageConfig.Transport.ServerList...)
  
  	for _, overrides := range s.Overrides {
  		servers.Insert(overrides.etcdLocation...)
  	}
  
  	tlsConfig := &tls.Config{
  		InsecureSkipVerify: true,
  	}
  	if len(s.StorageConfig.Transport.CertFile) > 0 && len(s.StorageConfig.Transport.KeyFile) > 0 {
  		cert, err := tls.LoadX509KeyPair(s.StorageConfig.Transport.CertFile, s.StorageConfig.Transport.KeyFile)
  		if err != nil {
  			klog.Errorf("failed to load key pair while getting backends: %s", err)
  		} else {
  			tlsConfig.Certificates = []tls.Certificate{cert}
  		}
  	}
  	if len(s.StorageConfig.Transport.CAFile) > 0 {
  		if caCert, err := ioutil.ReadFile(s.StorageConfig.Transport.CAFile); err != nil {
  			klog.Errorf("failed to read ca file while getting backends: %s", err)
  		} else {
  			caPool := x509.NewCertPool()
  			caPool.AppendCertsFromPEM(caCert)
  			tlsConfig.RootCAs = caPool
  			tlsConfig.InsecureSkipVerify = false
  		}
  	}
  
  	backends := []Backend{}
  	for server := range servers {
  		backends = append(backends, Backend{
  			Server: server,
  			// We can't share TLSConfig across different backends to avoid races.
  			// For more details see: http://pr.k8s.io/59338
  			TLSConfig: tlsConfig.Clone(),
  		})
  	}
  	return backends
  }
docs: // Backends returns all backends for all registered storage destinations.
  // Used for getting all instances for health validations.