Yeah, I wrote something that stores data to Flickr last summer: https://github.com/namwen/hoardr . I kind of had a reason but it was more for the enjoyment of getting it to work.
Until this gets so popular that Google or Flickr start to analyse photos, and come to the conclusion to either delete those photos and videos, or to convert them and destroying the data for you. Then, years later, you need your backup and ....
