Help creating character backstory?

I want to start creating my characters backstory so I can get into it more easily. However, my director was rather vague in the department of providing one. Is it okay for me to just make my own up, following the script as a guide? I worry that I’ll go to set with a completely different character than my director... show more I want to start creating my characters backstory so I can get into it more easily. However, my director was rather vague in the department of providing one. Is it okay for me to just make my own up, following the script as a guide? I worry that I’ll go to set with a completely different character than my director had in mind. We haven’t started filming yet.
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