Dahua DHI-NVR5208-4KS2 User Manual page 175

You can also do the following operations to the recorded files.
To back up the recorded files to the external storage device, select files, click

Backup, select the save path and file type, and then click Start. See Figure 4-106.
 To lock the files to make it unable to be overwritten, select the files, and then click
Lock.
To add a mark to the file, select the files and then click Add Mark.

 Go to Face Properties and Person Details to view detailed information.
4.7.1.2 Face Recognition
System can search and compare the human face on the video with the face image on the
database, and playback the corresponding record file.
The AI search includes two ways: Search by attributes and search by image.
This function is for some series products only.
4.7.1.2.1 Searching by Attributes
Step 1 Select Main Menu > AI > SMART SEARCH > FACE RECOGNITION > Search by
Attributes.
The Search by Attributes interface is displayed. See Figure 4-107.
Figure 4-106
Local Basic Operation 164