I have a folder(which contains a lot of sub-folders and files) on a machine,I used    du -m and it shows the disk usage of all sub-folders and files,anyway, the overall disk usage is 78MI used scp -r to copy the folder into another machine,this time, du -m get the overall disk usage: 12M,very different.Why does this happen?I'm afraid some of the files or sub-folders are not copied fully,so are there any other ways to check the total number of bytes?
`du` get different results on different machines for the same folder
disk usage;size