Planet NVR-820 User Manual page 75

Users can also set to keep a previous number of days of recording data by enabling the option
below. This is quite often used in application such as banking in which certain countries require
to always keep a minimum previous number of days of recording data.
* If this option is enabled, once the hard drive is full, the recycle function will then
start but it will ensure that the number of days of recording data defined here will
stay in hard drive instead of wiping out 20GB of data at a time.
* If the hard drive is not full, the NVR re-calculates twice a day (each at 2:30am
and 2:30pm) to keep the defined number of days of recording data from these two
particular points of time backward.
The section at the bottom of the page allows you to disable audio recording (record video only)
of particular channels.
Network Video Recorder with HDMI
75
NVR‐820 / NVR‐1620