Robocopy

Robocopy can be used to move files from one place to another in a network while doing checks on any failed files, retrying, and most importantly keeping the security descriptors associated with each file folder.

Here's the command I generally use:
robocopy :\ \\\ /mir /R:3 /SEC /W:3 /LOG:robocopy.log

I've just put it here so I don't have to look it up each time.