How to backup a cctv footage in hikvision dvr

How to backup a cctv footage in hikvision dvr
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[@veekeymaster3701]

Good...

[@4KAutomation]

💗

[@aneeshbabu2636]

👍

[@SamSung-yr9wy]

audio copy ആവില്ലേ bro ?

[@aswin5118]

Bro download avunnila

[@kailasnadh4532]

😍

[@8KTECH]

👍

[@SamSung-yr9wy]

I'm getting two video files for same timestamp. second one with A2_date_001 name, What could be the reason ? Thanks in advance