Do both. Or even all three. DVDs scratch or break, storage fails, Hard disks fail (As we speak I am recovering my daughter's files on her pc - thank goodness for the back up drive). Once you have the files copy them onto storeage and DVD and if you have space on the pc leave them there. Perhaps even get a second physical drive fitted with automatic back up of all your files on a continuous basis. It has saved my lot from tears many times over.
