import os, sys
from datetime import datetime

import winsys

TARGET = r"c:\temp\archive"
ROBOCOPY = r'robocopy.exe "%s" "%s\%s\%s" /S /move /copyall /minage:%s1231'

def min_datestamp (root):
  current_min = datetime.max
  for dirpath, dirs, files in winsys.walk (root):
    current_min = min ([current_min] + [f.accessed_at for f in files])
  return current_min

def main (root):
  if not os.path.isdir (root):
    raise RuntimeError, "Root must be a folder, not a file"
  
  source = os.path.basename (root)
  oldest = min_datestamp (root)
  print "Oldest file last touched at", oldest
  min_year = oldest.year
  for year in range (min_year, datetime.now ().year):
    command = ROBOCOPY % (root, TARGET, source, year, year)
    print command
    os.system (command)

if __name__ == '__main__':
  main (sys.argv[1])