• dry-run -n or –dry-run
  • -a 保持元信息
  • -r 递归
rsync -anv source/ destination

用于同步照片：

rsync -anv /Volumes/Untitled/DCIM/100MSDCF/ /Volumes/backup/camera
rsync -av /Volumes/Untitled/DCIM/100MSDCF/ /Volumes/backup/camera