Data domain seeding with tapes

Hi!

Our customer has the following scenario:

DD2500 on primary site

DD670  on remote site

however the interconnect link is quite slow between the two sites

and customer want to synchronize approximately 15 tb data on a slow link (100 mbit).

We use pool replication and we use Networker at both site.

We have two identical Networker server on both side.

My questions:

- How can we transfer 15 Tb data from primary site

  to secondary site as fast as possible?

  (DD670 or DD2500 cannot move, and we dont have third DD)

- Can we use tapes on primary site and transfer it to the

  secondary site and add to the pool?

 

  What is the step-by step guide to do this?

Thanks a lot.