I have come to the conclusion that nothing short of continuous recording is going to do me any good. I can't remember how many times I have missed an event because the camera sent me an empty snap, a late snap, an early snap, not enough snaps or missed it entirely. I have a camera pointed at the driveway. You can walk from the street side all the way to the garage door( at least 30 feet) and get just one snapshot, and I have the entire driveway marked with blue grids.