Export guide — Dahua / Amcrest
Amcrest, and many no-name recorders, are Dahua inside — the same menus apply. You'll need a USB stick (32 GB or larger). When you're done, head back to the upload steps.
Use a USB port on the recorder box itself.
Right-click with the recorder's mouse → Main Menu → Backup. Log in if asked.
Select the channel (camera) covering your sales floor, set the date, and start/end times to your opening hours.
Set File Format to MP4 if the option exists (otherwise DAV is fine — we can read it), press Add to list the clips, then Backup/Start. Leave it running until the bar completes.
Using a computer instead? Install SmartPSS (Dahua's free desktop app) or Amcrest Surveillance Pro, connect the recorder, then Playback → select camera & time → Download.