DFS replication is not working across forest. What would be an alternative option for migrating servers?

We have over 100 file servers and all of them sending the copy of their data using DFS to one clustered server - File01.

So, for our migration it is not feasible to migrate all 100 servers all at once. Also, I tested and the two servers that are members of the replication group in DFS have to be in the same forest in order to replicate. The replication stops if I move one server in a different forest.

Please let me know what would be the other options to migrate file servers that all replicate to one server. For example, could we set another server in the target and to copy data there? Could we setup a new target folder for migrated file server? Should we migrate clustered servers first or last? Should we use robo copy to ensure data in sync? etc I think it will take extremely long time to copy the data to the new server if we choose other server as a replication partner.
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So all file server are in one forest now and you need to move them to another forest. Is this correct?
creative555Author Commented:
Yes. Thats correct!
I would recommend "seeding" the destination file servers by retoring contact from backup. Then use a third party application like Peer http://www.peersoftware.com/products/sync-backup/peersync-for-servers.html to keep them in sync then break the sync during an outage and cutover to the new DFS only..

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creative555Author Commented:
Thank you so much!
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