make initial replication size as small as possible

We've got a new email server (Exchange  2016) and it's not being replicated yet.   I'd like to attempt to just replicate the whole thing without doing a seed drive.  BUT I know I need to make the initial replication as small as possible. I don't need to replicate all the recovery points.  What's the best way to go about doing this?  

Total recovery points:46 - Total protected data:5.04 TB

actual amount of data 2.2 TB.

Transferring 2 TB is going to be a lot, transferring 5 TB is not happening!

any advice is appreciated,