Ok, so within Portainer, I click New Container and named it Ur Backup.
the image I am using is uroni/urbackup-server.
on Volumes, I click map additional volum and then bind. in the container, i enter /backups and then deploy container.
it then says urbackup is running on my dashboard
I don't like spaces in container names because they must be escaped in the shell when you handle things docker there. Personal preference though.
Your Volume definition is incomplete. What image documentation did you consult when setting this up?