Dahua DH-XVR5104HS-4KL-I3 User Manual page 214

Select one or multiple results, and then you can
Click Export to export them to the USB device
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Click Backup to make backup in the DVR
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Click Lock so that they don't get overwritten or deleted
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Click Add Tag to name them as needed.
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Non-motor Vehicle Detection
Select Main Menu > AI > AI Search > Non-motor Vehicle Detection.
Extra face features
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User's Manual