QNAP Security VioStor NVR (Version: 4.1.1) - Manual (Page 205)

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The page will automatically refresh the status every fifteen minutes.
6.6.6 Advanced Settings
Configure the advanced recording settings in this section.
 Maximum period for each recording file: Specify the maximum length of each recording
file (maximum 15 min).
 When the available storage is less than…%: Specify if the NVR should overwrite the
oldest recordings or stop recording when the available storage capacity is less than the
specified percentage of the total storage capacity. It is strongly suggested to select 5%
or above.
 Keep alarm recordings for at least…day(s): Specify the number of days that alarm
recordings will be retained.