Welcome to the forum Nixter.
I would never have G sensor on while driving, dont make sense if the camera are recording all the time anyway. ( and most all cameras should record all the time when on )
I use the event button for little things i want to save, that include a minor fender bender if i should ever get into one of those.
If i get knocked out in a major crash i put my trust in sufficient large memory card, and the fact power in my car should be turned off pretty fast.
Also if you have a card full of event files, that can not be overwritten, that leave little room for the regular driving files, so with a small memory card you could potentially only have minutes of that footage if events take up the rest of the memory space.
In a 2 channel system you should at least have a 128 GB memory card,,,,,, some sell their cameras with ridiculous small memory cards.
If you dont use the camera for parking mode, you need to do 2 things first.
1: disable anything to do with G sensor and motion detect
2: format your memory card in the camera
I am not familiar with the blackvue cameras personally but most new dashcams put events in a folder named RO ( Read Only ) the regular files are for the most stored in 2 ways.
A: in the same folder with the cameras alternating so you have front camera ( often suffixed A ) and then rear camera ( often suffixed B )
2: other cameras put the files in their own folder, so the front camera footage go in a folder named front, and the rear camera footage go in a folder named Rear
In this video you can see the file structure of my SG camera, it have the 2 feeds in the same folder ( movies ), each file named by time/date and then the suffix A or B to be able to tell the cameras apart.