A car backed into me in a convenience store parking lot. I was in the process of parking when the other driver backed up and veered right into me.

More likely than not, yes, the car who backed into you is at fault for the accident.  Depends on whether or not you were moving as well when you were hit.  If you were injured, I would contact an experiened personal injury attorney.    This response is only a basic answer to your question and is not intended to be legal advise. It is your job to hire an attorney and to discuss the specifics of this question with him or her. I am not giving you specific legal advise and there is no attorney-client relationship created by my answer to your question. The choice of an attorney is an important decision that you must make and that choice should not be made upon adverting alone