If you've yet to rescue your data from Vine, then you can head into the app and go straight to your own profile page. Beneath your avatar is a Save Videos button, from which you can either back up the clips to your phone or get a download link. The latter is probably preferable, since it also comes with a log of your likes and re-vines for every clip you shared. You can watch those while you console yourself that you were only just one decent re-vine away from becoming the next King Bach.