Cisco :: User Privilege Level For Configuration Backup With PI 1.2

We have more than 50 devices handling by PI 1.2 (testing) I like to know how to do configuration archiving with user who doesn't have write privilege.
  
I tried like this.
  
username john privilege 6 password cisco privilege exec level 6 show running-config
  
(result) show run --> blank
 
  I tried this user with one of switch in PI 1.2. It did not do configuration backup
 
username inout password inout username inout privilege 15 autocommand show running-config
  
(result) once logged in, it automatically showed running-config. However when I tried with PI 1.2 with this user (inout). I couldn't do configuration back.
 
reference [URL]
  
create certain user with read-only privilege while PI 1.2 is able to do configuration archiving ?