My disastrous mistake with flashbacks… In my first original fic I posted here, because it was a huge group of people, I started inserting chapters of flashbacks, one after another, covering how the different characters got there. Reviewers were getting confused “isn’t he dead?” Once I realized I had basically had multiple stories in it, I started to peel them off as SEPARATE stories, and it’s way, way better. Of course, haven’t finished those backstories, still working on them, and plan to get back to the main story… eventually.
For instance, Jefferey is backstory that delves into the subversive underground group trying to counter the strong religious push/indoctrination of the main society. Alaska Trekkers shows how two join up to the main story. Dale’s Game is intended for one of those too (though it derailed, so it’s eventual rewrite will fix that). Once I start clearing out the backstory & rewrites, I do intend to get back to the main story In the meanwhile, this potter fanfic isn’t going to write itself.
Overall, I minimize flashbacks, as it’s usually a symptom of planning issues. However, they can have a place.