Network Video Recorder User Manual 
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  The redundant  record  is to  decide whether  you  want  the  camera  to  save the  recording  files in  the 
redundant HDD. You must configure the redundant HDD in HDD settings. For detailed information, 
see Chapter12.3.2 Setting HDD Property. 
  The parameters of Main Stream (Event) are read-only. 
3.  Parameters Settings for Sub-stream 
1)  Enter the Sub-stream tab page. 
 
Figure 5. 5 Sub-stream Parameters 
 
2)  Configure the parameters of the camera. 
3)  Click Apply to save the settings.