Since upgrading from 11D to 12.5, we are backing up to disk first, then Duplicating the B2D file to tape. For every job except the Exchange job, the Byte Count between the B2D and Duplicate jobs are the same. However, the Exchange jobs show different Byte Counts.
Every exchange backup is a full backup with GRT, and we have been able to granularly restore a public exchange folder from backup.
This table shows the last 3 backups:
When job ran B2D Byte Count Duplicate to tape Byte Count
Tuesday night 84,638,591,670 84,643,834,648
Monday night 84,870,426,124 84,875,669,102
Weekend 84,854,696,462 84,859,939,462
Why doesn't the byte count match? It matches on all 8 other backup jobs!