For my story Through a Dragon’s Eyes, I actually had to skip the backstory checkpoint altogether. This is because my little dragon is born/hatched in the first chapter, so he has no backstory to tell. Therefore, we quickly jump directly from the hook to the trigger.
Hook: The little white dragon hatches from his egg.
Trigger: The little dragon awakens the next morning, aside his siblings who are still strangers to him. They are all hungry, but there is no food in the cave and their parents are missing.
Again, this trigger will jump directly into the crisis. The absence of his parents in this strange new world will attack his insecurity, creating a lot of emotional turmoil in the immediate aftermath.