VTL's are a dieing technology.  People much prefer to backup to disk, going 
further with backing up to a disk target that does deduplication.

Your 9TB's of Exch is nothing with modern dedupe appliances.

VTL's are complex when they don't need to be.  They emulate tape,and suffer the 
same physical limitations that tape has, even though it's "virtual."
It's much easier to move data over an NFS mount or CIFS share, and let your 
backup app clone or duplicate to tape from there.

My personal preference is just get the correct sized DataDomain box, and call 
it a day.  Go one step further and throw in BOOST, and a 2nd box and you can 
replicate your data through NW as a simple clone job.  Now you can minimize or 
completely eliminate your tape requirements if you replicate to a different 
location.

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