In a server migration, if you have a lot of files to move and have to move them in full operation or with a minimum of down time this tools will help you. (sure there are more of this kind)
Use Ycopy to make first copy of all your folders and files. Ycopy gets around all of the problems of Windows/dos Windows Explorer, copy and xcopy programs. With these tools, Long filenames, long paths, corrupted files and errors, cause them to just stop. Ycopy just logs these and goes on. First copy of folders and files will be your master copy and for sure take some times if you huge amounts of data. Next tools you will use is Total Commander just before you must turn off the server you are about to migrate. Use Total Commander to verify the folders and files to just copy over folders and files with changes., this means that at a migration will have minimal down time.
You can find Tools here:
Ycopy: It seems that it is difficult to find Ycopy for download from http://www.ruahine.com/
Total Commander: