How To create a new DAG across a WAN connection?

In preparation to moving our mailbox/hub transport server from our local office to a data center, we would like to create a DAG, putting the second mailbox server into the data center
What is the best way to start a DAG when the servers are across a WAN link?  There will be about 800GB data in the databases including primary mailboxes and archives.
This is how the existing 2-server layout looks now (they are both Hyper-V VMs):
There is a CAS-only Exchange 2010 server already in the data center as shown in the diagram.  Can we just add disk space and RAM to this CAS and enable the mailbox and hub transport roles on it and then sync the mailbox data to it over the course of
several nights?  Can we restore the database from the previous day's backup of the other mailbox server to give it a head start?
Once we have an up to date mail database working on in the data center and are able to use it, we would then like to disband the 2010 DAG, retire the original Exchange 2010 mailbox/hub transport server in our office and then migrate to Exchange 2013 with
a new DAG in the data center.

Hi ,
As an additional info , database portability can be used on the following conditions.
So we cannot swap the mailbox databases between the exchange 2010 and exchange 2013 and also we cannot make use that feature for public folder database.
My suggestions : 
First option : 
Please install the MBX and HUB role on the server "exch 2010 CAS" and then use the database availability feature to mount the databases on the server "exch 2010 CAS" by using the restored .edb files and log files from backup.
As Li
Zhen mentioned you can use the database portability feature by referring the Paul's article.
To have the up to date data availability we need an down time ,because you need to dismount the current databases once the full backup get completed to avoid creating of new logs.By doing so all the emails will get queued .Then we need to restore the .edb
files and its respective logs on the server "exch 2010 CAS" .Then we need to create and mount the new database by using restored edb and log files by using the database portability method.Then we need to redirect the users from the old database to
the new database on the server "exch 2010 CAS" .So till that time there would be an downtime for the users.
Second option : 
Please install the MBX and HUB role on the server "exch 2010 CAS" .Then create the new dag with both exchange 2010 as DAG members.
Then on the server "exch 2010 CAS" , please do not seed the database by using the command update command.Instead you can follow the article to have the up to date passive copy but there will be a down time.
https://social.technet.microsoft.com/Forums/exchange/en-US/bc6c739f-cbbb-4242-8d62-4182afd157b7/exhchange-2010-sp3-dag-pre-seed-with-arcserve-r15?forum=exchangesvravailabilityandisasterrecovery
Then the final step would be to mount all the databases on the server "exch 2010 CAS" .Once your exchange 2013 environment is ready then you can start moving the mailboxes to the exchange 2013 servers from exchange 2010 server i.e "exch 2010
CAS"
Note : My suggestion would be to go with the second option.
However on my side i am checking is there is any other way to avoid the downtime.If anyone knows about such kind of technologies please share with us.
Thanks & Regards S.Nithyanandham

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