Inkrementelles Backup ohne Archivbit und Änderungsdatum (Robocopy?)

import hashlib
import os
import sys
 
def md5checksum(filePath):
    with open(filePath, 'rb') as fi:  
        h = hashlib.md5()
        while True:
            data = fi.read(1024)
            if not data:
                break
            h.update(data)
    return h.hexdigest()
         
def scandir(dir):
    print "Scanning %s" % (dir,)  
    fdata = {}
    for root, dirs, files in os.walk(dir):
        for name in files:
            fullpath = os.path.join(root, name)
            path = fullpath[len(dir):]
            fdata[path] = md5checksum(fullpath)
    print "Found: %i Files" % (len(fdata),)  
    return fdata
 
 
def main(firstpath, secondpath):
    """ Give me two directories to compare """  
    first_data = scandir(firstpath)
    second_data = scandir(secondpath)
    for file, md5 in first_data.items():
        if file not in second_data:
            print "%s only in %s" % (file, firstpath,)  
        else:
            if second_data[file] == md5:
                del second_data[file]
            else:
                print "%s not the same" % (file,)  
                del second_data[file]
    for file, md5 in second_data.items():
        if file not in (first_data):
            print "%s only in %s" % (file, secondpath,)  
        else:
            print "%s <-- You see this? Something gone WROOOOOONG!" % (file,)  
 
if __name__ == "__main__":  
    main(sys.argv[1], sys.argv[2])