Edit: The array is actually RAID1, slight communication hiccup with the rest of my team.
Following the decommissioning of one of our server, a manager just realised there was, after all, data that he needed from that server. Now due to proper protocol not being followed, the server was re-imaged before a complete backup was taken and we're past our 5-week retention period. The raid 1 array in question was the system volume and those 2 hdd have since been reconfigured in a new RAID 1 and a new OS was installed. RAID controller is HP Smart Array P400i/256MB Controller.