I am looking into the concept of an abandoned planetary colony which was, before abandonment, pretty much the interstellar version of Australia (back when it was where Britan dumped criminals). The total population of the planet is large enough for multiple large-ish settlements, but everyone's descended from criminals deemed unworthy to be bothered with. Prisoners were set up with mining equipment and told that they could, theoretically, buy their freedom, but the government which put them there has ceased all contact for unknown reasons. Old gangs quickly begin vying for control as they once had.
The question is this: would someone in this situation bother recording accurate historical info? If the colonies' history was merely oral tradition, how many generations would it take for the colonists to have a seriously warped idea of where they came from?