PLANET NVR-420 - Manual (Page 38)

If the "3 continuous snapshots" option is chosen, the new window displays
snapshots and lets you view them individually by using the "Prev", "Next"
buttons shown above.
However, as soon as a snapshot selection is made, the snapshots are
automatically saved to x:\SnapshotFolder ("x" represents the partition
where Windows is installed, e.g: C:\)
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4-CH H.264 Network Video Recorder with HDMI
User’s Manual of NVR-420