Does the IBM 7720/7740 copy just the blocks that have changed or all the data 
for offsite backup?

Have to transmit 9 TB compressed data nightly  in 18 hours offsite to DR using 
a IBM 7720/7740 hybrid.

Trying to estimate how long it would take on a 1 Gbps and a 10 Gbps pipe or 
OC-36 or OC-48.

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