實際效果：假設給定目錄"/media/data/programmer/project/python" ，備份路徑"/home/diegoyun/backup/“ ， 則會將python目錄下的文件按照全路經備份到備份路徑下，形如：

/home/diegoyun/backup/yyyymmddHHMMSS/python/xxx/yyy/zzz.....
代碼如下:
import os
import shutil
import datetime

def mainLogic():
    #add dirs you want to copy
    backdir="I://backup"    
    copydirs=[]
    copydirs.append("D://programmer")
    copydirs.append("D://diegoyun")    

    print "Copying files  ==================="
    start=datetime.datetime.now()

    #gen a data folder for backup
    backdir=os.path.join(backdir,start.strftime("%Y-%m-%d"))
    #print "backdir is:"+backdir

    
    kc=0
    for d in copydirs:
        kc=kc+copyFiles(d,backdir)

    end=datetime.datetime.now()
    print "Finished! ==================="
    print "Total files : " + str(kc) 
    print "Elapsed time : " + str((end-start).seconds)+" seconds"

def copyFiles(copydir,backdir):
    prefix=getPathPrefix(copydir)
    #print "prefix is:"+prefix    

    i=0
    for dirpath,dirnames,filenames in os.walk(copydir):
        for name in filenames:
            oldpath=os.path.join(dirpath,name)
            newpath=omitPrefix(dirpath,prefix)
            print "backdir is:"+backdir            
            newpath=os.path.join(backdir,newpath)
            print "newpath is:"+newpath

            if os.path.exists(newpath)!=True:
                os.makedirs(newpath)  
            newpath=os.path.join(newpath,name)