Haa, i didnt paid attention to the important part , centos6 , not 7
Did you tried the docker, if you never used docker before, that may be a little rough way to start.
Run UrBackup Server in a docker container via
docker run -d --name urbackup-server-1 -v /media/backups:/backups -v /media/database:/var/urbackup -p 55413-55415:55413-55415 -p 35623:35623/udp uroni/urbackup-server
this will map /media/backups from the real server to /backups in the docker context , same idea for the ports, and everyting with a : separator
If needed you should be able to get the docker id via “docker ps” and then enter the docker context via "docker exec -it xxxIDxxx bash"
But really all operations should work via the web ui.