PLANET NVR-3250 - Manual (Page 68)

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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 which certain countries requires to always
keeping 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 allows you to turn on or off a particular recording type on any channels.
The “Camera Recording Setting” section allows you to turn on or off a particular recording type on any
channels.
The section at the bottom of the page allows you to disable audio recording (record video only) of
particular channels.