QNAP Security VioStor NVR (Version: 3.5.1) - Manual (Page 188)

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8. Real-time digital watermarking: Enable this option to add digital watermarks to the
video files as soon as they are recorded to the NVR. Use the Watermark Proof utility
to verify if the video files were maliciously modified. For more information of digital
watermarking, refer to Chapter 5.2.
9. Enable recording data retention: Turn on this function and specify the minimum
number of days to keep the recording data. Note that the number of days entered
here must be smaller than the maximum number of days to keep all recordings
configured in ‘Camera Settings’ > ‘Advanced Settings’.
10. Enable auto snapshot: Select this option and the settings will be displayed. Configure
up to 15 schedules for automatic snapshot taking or specify the number of snapshots
(max 60) the NVR should take every hour. The snapshots are saved to the share
folder of the NVR by default. Specify a remote server to where the files will be saved.
Read/write access to the remote server is required.
Note:

Starting and stopping manual recording will not affect scheduled or alarm recording
tasks. They are independent processes.

All the settings will not take effect until ‘Apply’ is clicked. When applying the changes,
recording will stop for a while (maximum 1 minute) and then restart.