man, backflips are so easy. once you try your first one you'll be way surprised how easy they are... for mine I just build a real lippy jump into a lot of powder, just balls out go for it real fast and pop off the lip just as you'd jump on the tramp, do it the exact same as on the tramp and you will see the landing in no time, from there open up or tuck in depending on height from ground, how much rotated, etc... that's natural though. easier than 3s in my opinion, i landed my first try