How does Robocopy copy files?

I have a question about Robocopy how to copy a file?
Is it overwrite old file or update it ?
Thanks.

Hi,
I assume that you now understand what differential copies mean according to the second link provided by
arnavsharma , you may want to copy\filter\overwrite copies as you want, if so, I'd like to introduce a tool with you:
Robocopy GUI,
http://technet.microsoft.com/en-us/magazine/2006.11.utilityspotlight.aspx
"The biggest benefit I think you'll find is the ability to create full mirror
duplicates of two file structures (including all subdirectories and files, if
you choose) without copying any unnecessary files. Only the files that are new
or have been updated in the source location will be copied."
And another useful command Xcopy, the /d option 
/d [:MM-DD-YYYY]
Copies source files changed on or after the specified date only. If you do not include a
MM-DD-YYYY value, xcopy copies all Source files that are newer than existing
Destination files. This command-line option allows you to update files that have changed.
http://technet.microsoft.com/en-us/library/cc771254.aspx
Yolanda Zhu
TechNet Community Support

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