Unfortunately something rather disastrous appears to have occured. I loaded up the backup disk, and found it nearly empty (928GB free of 932GB). This was not the case last time I tried a restore job (the disk was nearly full, and included several useful backup sets).
While the lost backup was not crucial, I am trying to prepare this equipment for potential backup restoration processes in the future and it now appears some part of the process of catalogging and inventorying this tertiary disk in fact erased the concents. Could someone with a keen eye for error maybe go over my earlier posts and point to where that might have occured? Keeping in mind that this disk had all its contents intact right up until the last error I saw on March 11th, and it has been disconnected from all devices (and power) since then.