PLANET NVR-420 - Manual (Page 28)

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:\)
You can right-click anywhere on the image and select "Save Picture As..."
to save the images somewhere else if you wish.
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4-CH H.264 Network Video Recorder with HDMI
User’s Manual of NVR-420