Ghost 15.0 - File and Folder backup

I have moved from NS&R 1.2 to Ghost 15. I backup my Outlook files daily as I did with NSR. As a test, I tried to restore my Outlook.pst file from last Monday. When I went through the recover my files dialogue, the only version of outlook.pst that was reported was the most current one. This even after I clicked show all versions. When using NSR, this routine would return all the available versions on my HDD backup. My question is: Does Ghost 15 operate differently or more likely, what am I doing wrong or what setting(s) in my file/folder backup job do I need to adjust??  many thanks