When CCTV footage is recorded, it is saved on a local hard disc, or a cloud server, or an offsite server. In most cases, after 15 days or a month depending upon the storage available in the DVR

This video is about how to calculate HDD space required for recording of cameras in NVR/DVR with encoding format, resolution, fps etc. with Dahua Disk Calcul

It installs onto a PC, and leave the HDMI connected to the TV. Works wonders as well. You can record to your local HDD as well without having to rely on the NVR. There's also iSpy, but I haven't been able to yield the same picture quality out of this software compared to others. Otherwise, plenty of options out there.
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Configure the security questions and answers. Page 10: Configuring Recording Storage Schedule Configuring Recording Storage Schedule Select Main Menu > STORAGE > SCHEDULE > Record, the Record interface is displayed, see Figure 3-3. The default setting is 24 hours recording for all channels. You can modify the settings if needed.
Once you have selected all desired recordings that should be removed, click “delete” and confirm your action. When prompted, ensure to select ‘delete files permanently’ or similar as opposed to ‘move to trash’. With this action selected all unwanted footage andmetadata is removed from the recorder.
When there are several decoders, please add 120 Ohm between the PTZ decoder A/B cables furthest end to delete the reverberation or impedance matching. Otherwise the PTZ control is not stable. To enter PTZ menu, right click and select PTZ and select OSD menu.
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how to delete cctv recording dahua