Understanding file transfer to between Datadomains

Hi all,

i'm nebwy on this community and datadomains:Smile:  We have 2 data domain. one is on Center(DD1) the other is on DR we call them DD2. Our veeam backup on DD1 ant it is pretty big. DD1 de-duplicate data and send the  to DD2. But the problem is data is too big and the line betwwen DD1 and DD2 is not enough. 

Correct If I'am wrong pls ,

Our daily Post-Comp data : 600GB- 1000GB 

Line Between DD's: 20 Mbit

Precomp remaining: 63455 GB

My Question is: obviously this line is not enough. How much Data line Mbit's should be? 

What is meaning of pre-Comp remaining, post-comp written, post-comp replicate(ELI5 :BigSmile:)? 

How can I measure the replicated data between DDs daily and how much data remaining? 

Thaks for your advice,

mtree show compression

performance graph -2performance graph -1