This is awesome and i only now begin to really grasp the importance of things like this. I recently showed some german post and pre WWII footage to my grandma on youtube and she was delighted about the ability to access that kind of rare footage on demand. I recorded her commentary while watching the videos which was super interesting. She remembered many small details of living in Berlin post-war that she probably wouldn't have otherwise. She is 87 now, so i plan to do this a couple more times and make a video that shows the footage with her commentary on it, just to be able to preserve some of her thoughts and feelings.