What happens when you back out and hit your other vehicle parked in the driveway?

You can pay for it yourself or file a claim with your insurance company and they will take care of it. Do realize that your premiums will go up. So do the math, if the damage is more than your deductable plus the difference in what you will pay if your insurance goes up (for 3 years worth or however long your company raises the rates after an accident), then it is worth it. You can either fix it or leave it damaged. If the damaged vehicle carries collision insurance (not just liability) you can probably have repairs made but you get to pay the deductible.