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Disk to Tape - Transfer Rate VERY Slow

I am using Backup Exec 2014 to do Full Backup then Incremental backup Disk then to Tape.  This particular backup is an Exchange 2013 server backup.  I have the license.

Problem,  the backup to disk runs just fine, transfer rate very good.  BUT, for just this ONE backup to tape (I have 14 other server backups and they run fine from disk to tape) the transfer rate has dropped now to 32MB a minute.  I have a 1GB network between the disk array and tape library. 

What is going on?