We are in the early stages of implementing EMC Data Domain dedupe appliance and 
use Symantec NetBackup. I've a couple of questions about it for the experts. 

Plan is to have a DD appliance in 1 location and replicate data to another DD 
appliance in another location. Plan is also to generate a tape copy for long 
term archival at primary location. 

1.OST & VTL are both being discussed. Which option is most favorable in the 
industry? Are there any specific advantages that can make or break things?
2.VTL supports LTO3 drives at the most. Does this mean that we need to have 
LTO3 physical tape drives for duplicate copy or will LTO5 drives work?

Thanks in advance.

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