I try not to be too specific with my characters' background to begin with for that very reason. For example, my Raen is a prince from a small village on the northern bank somewhere on the One River. Though, no one knew that about him ICly. Most people only know he's a wandering samurai, and that allows me to keep it simple enough that if the rest of my backstory somehow became unplausible, I could change it without too much difficulty, save for parties who know who he really is, and most of those would be in the same boat as me anyway.
I think the more generic your character is, the easier it'll be to get more specific later as more lore becomes available. However, another way is to often base your character on currently known lore, so there's a lesser margin of error.
I think the more generic your character is, the easier it'll be to get more specific later as more lore becomes available. However, another way is to often base your character on currently known lore, so there's a lesser margin of error.
