Hello George,
I beleive you should try the TAPECORE forum for your kind of question.
Arye.

On 23 February 2012 23:16, Henke, George <george.he...@hp.com> wrote:

> 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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