Dahua NVR6000 series User Manual page 72

Select the snapshot channel from the dropdown list and then select snapshot mode as Timing (Schedule)
from the dropdown list and then set picture size, quality and snapshot frequency.
Figure 3-50
In the main menu, from Main menu->Setting->Storage->Schedule, you can go to schedule menu.
See Figure 3-46. Here you can set snapshot period. There are total six periods in one day. Please refer
to chapter 3.7.2.1 for detailed setup information. The setup steps are general the same.
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