This is actually something that people have been requesting for a while, but unfortunately we don't have any plans to change the way it works at the moment.
There is a workaround you can use to allow non sysadmin users to backup. See the following topic:
http://www.red-gate.com/MessageBoard/vi ... 7970#27970
We don't have any useful training videos for setting up service rights (which we probably should). However, where 3rd party SQL Server backup tools are concerned, they mostly all leverage a SQL Server virtual device, and in order to create a virtual device, the account needs to be a member of the sysadmin fixed server role. We can't really get around it, so you don't really get a lot of choices with regards to the types of account you can use for the services.
The logon account for the UI or the SQLAgent service will be 'users' for the job, so they should be able to be non sysadmins. I apologize that isn't possible with SQL Backup, but the workaround should hopefully help.