[otrs] 2.4.4 to 2.4.5 patch / migrate

Hi All, How do we upgrade from otrs 2.4.4 to 2.4.5 ? The admin manual does not show how. When i download the new software from otrs web site it says that it's already installed which is an expected result. For the upgrade of a running system (for minor patches like 2.4.4 to 2.4.5) What is the roadmap that i have to follow? Should i have to stop the services get the backup install a clean otrs and restore the backup? or is there an easier way to do it? If there is only backup / restore method is there guide about that so i can follow the quide and update my otrs. Thanks & Regards, Sarper Sarıdal