Why is my HomeSecur camera deleting the recorded videos?

You may have activated the auto-file overwriting function of the camera. This function allows the camera to automatically overwrite the earliest dated files to be able to continue recording when the memory card is full. You can change the Overwrite feature from On to Off from the camera settings but make sure to regularly check your camera to avoid memory full.

You can go to "How to change the camera settings of HomeSecur?" article for instructions on how to access camera settings.