Auto backup folder every 30 minutes & replace with new o

Hi my friends ,
I need a software to automatically backup a folder every 30 minutes & replace with the old one.
I need to “don’t ask anything & pup up , Do it automatically”
Windows 7 X64 .
Thanks a lot.
Answer #1
Syncback (also cracked versions here):
http://www.2brightsparks.com/download-syncback.html
Belvedere:
http://lifehacker.com/341950/belvedere-automates-your-self+cleaning-pc
Answer #2
Acronis True Image Home will do it also (nonstop backup option)