Just as a followup to our previous post...
The problem outline has been determined by Symantec to be "the way it works". There will be no fix to this since it is a "feature enhancement request".
The two links provided by "pkh" have been updated by Symantec to indicate this.
Also as noted the "reports" for Backup Exec 2012 are ONLY for tape drives. They provide little information about media or backup sets that are contained in "backup to disk" folders.
At this time, we view this problem as one of any ways to return functionality to Backup Exec 2012.
The core problem is very simple. There is no way to determine what "backup set" goes with which "backup job log". So if a job runs, you don't need it any more, there should be a way to easily get to the "backup set" for that job run and free up the space. The issue raised by this posting was just one way to get to that functionality.
As we noted with support we came up with four ways this can be done and any one of which would get us back to recommending Backup Exec.