Hi Team,I am getting an option to  upgrade osticket v 1.9.12 to v1.9.15.Can i directly upgrade it by clicking the Upgrade option, or do i need to do any manual work (like backup my old Database, or any other configuration).Please help me  how to do that .osTicket Versionv1.9.12 (19292ad)  Upgrade— v1.9.15 is availableMy osticket version is v 1.9.12 OS- Ubuntu 14.04 serverWeb Server Software Apache/2.4.7 (Ubuntu)PHP Version 5.5.9-1MySQL Version  5.6.30Thanks & Regards Rajendra