Back up folders or files

Hello,
Once a month or a week I want to copy all files from a certain folder to another folder.In the folder from witch I will copy files - there is a lot of files so aslo I need that the new folder ( to one that I will copy the files) will be generated each time with serial number(preferably date of creation as a name)
Can some one help me to write a simple script for it ?

Also I want that script stating in every windows sturtup - otherwise I just can forget to run it.

Thank all!