QNAP Security VioStor NVR (Version: 4.1.2) - Manual (Page 207)

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Remove recordings after…day(s): Enter the number of calendar days for the NVR to
keep the recording files.
Please make sure the storage capacity is enough to save the data for the number of
calendar days specified. When the recording data has reached the expiry date, all the
expired video files will be deleted. For example, if the NVR is configured to delete the
recording data after 7 calendar days, on the 8th day, the files recorded on the first day
of each camera will be deleted so that the NVR can start to save the data on the 8th day.
Pre-/Post-alarm Recordings
Start recording video…second(s) before the event occurs: Enter the number of
seconds to start the recording before an event occurs.
Stop video recording…second(s) after the event ends: Enter the number of seconds
to stop the recording after an event ends.
The maximum number of seconds for the above settings is 300, i.e. 5 minutes.
Note: All the settings will be effective only after clicking ‘Apply’. When applying the
changes, the recording will stop for a while (maximum 1 minute) and then restart.