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This was an adequate implementation for most peoples’ needs at the time. When I wrote the “security copy” part of Robocopy on, I chose to do this for performance reasons, to keep Robocopy times for large trees down. If a file looks like it has NOT changed, Robocopy by default skips it, and copies nothing for the file, not even its security info. If a file looks like it has changed, Robocopy copies its data and, if you specified copying security as well, copies NTFS ACL from source to target after copying the data. Robocopy focuses on copying just files that have changed (in size or modified date, by default). Robocopy fails to mirror file permissions – but works for folder permissions. You want to use the /MIR switch to mirror the permissions: Then, file or folder permissions (ACLs) are changed wither on source or destination. The situation is: suppose that you copy your files using Robocopy in Windows Server 2003 or XP. Some customers pointed out what they believe to be a bug in Robocopy. In these scenarios (i.e.First published on TECHNET on Jul 31, 2008 In addition if fastcopying a single file and the destination file already exists the destination file will be removed and replaced by the result of the fastcopy command.

When fastcopying directory trees (or entire mtrees) if the destination directory (or mtree) already exists the destinations current content will be removed and replaced by the results of the fastcopy command.