RoboCopy

RoboCopy or Robust File Copy for Windows is an enhanced file copy that far surpasses what you can do from either the Explorer or XCOPY.
It is a very robust command line driven program with a huge amount of switches and options. In addition to standard switches like /S for subdirectories,
Just a short list is:

• /PURGE :: delete dest files/dirs that no longer exist in source
• /MOV :: MOVe files (delete from source after copying)
• /MON:n :: MONitor source; run again when more than n changes seen.
• /MOT:m :: MOnitor source; run again in m minutes Time, if changed
• /MAX:n :: MAXimum file size - exclude files bigger than n bytes.
• /MAXAGE:n :: MAXimum file AGE - exclude files older than n days/date
• /R:n :: number of Retries on failed copies: default 1 million
• /TBD :: wait for sharenames To Be Defined (retry error 67)