LT Security LTN7600 Series NVR (V2.2.3) - Manual (Page 75)

User Manual of DS-9600/8600/7700/7600 Series NVR
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Figure 5. 26 Encoding Record
2) Select Camera you want to configure in the drop-down list.
3) Check the checkbox of Redundant Record/Capture.
4) Click OK to save settings and back to the upper level menu.
Repeat the above steps for configuring other channels.