rsync on vfat:

  rsync -v -rltzu --modify-window=300 ...
  http://www.linuxquestions.org/questions/linux-newbie-8/what-is-the-rsync-flag-to-ignore-permissions-800765/

  rsync --modify-window=1 -av ...
  http://www.kylev.com/2005/03/29/rsync-and-vfat/