[Koha] Upgrade koha 3.2 to koha 3.8.9

Hi to allI installed koha 3.2 on ubuntu 10.10 from 2 years ago , now we will prepare a new server ubuntu 12.04 server edition to install koha 3.8.9 , how come i transfer my data from old server to new server .any suggetion. MOHAMED MEGAHED Librarian & Technical support Misr International University Library Tel : +2 0100 22 97 96 2 Tel : +2 011 23 502 505