backing it in happens when you're braking hard enough that the rear wheel has barely any weight on it... you then downshift and the engine braking basically drags the rear wheel along because there's not enough friction on the rear wheel to spin it fast enough to meet the speed of the pavment.... the tire then smears across the pavment. Sometimes it steps out to the side (especially once you've entered a steering input into the equation)...
As long as it's still smearing & doesn't hook up while it's stepping out, you're not gonna highside. It's when it hooks up while it's still getting hung out there that you risk getting tossed up & over the bars.
It's no so much a technique as it is a result of going fast, braking hard and downshifting quickly.
It's really tough to describe.... I found a really interesting article that might interest you but for the life of me, I can't find it right now
EDIT: FOUND IT!!!!
http://www.supermotoracer.com/SMR%20Tec ... ckitin.pdf
Rider for ECK Racing
, instructor for Tony's Track Days and RiderCoach for Ironstone Ventures
The Garage: '03 Aprilia Tuono (street/track) | '06 Suzuki SV650 (race)