Offline allows the user to transport replication packages using whatever method they choose. In this case, Replicator continues to compress content into packages, until the operator runs the Export-ReplicatorPackages PowerShell command. At that point the packages are marked as Exported.
Once the packages are delivered to the remote server, the operator runs the Import-ReplicatorPackages PowerShell command. At that point, the packages are decompressed from the Import directory, applied to SharePoint and the packages are marked as Applied Complete.
When Offline Transport mode is selected, you will be able to input the Offline Transport Settings. Input the Target External ID if it is known. If it is not, the Target External ID can be provided during the import procedure. This ID can be found on the Configure Web Application page for the web application in question.
SFTP connections use SFTP servers to replicate between two SharePoint farms.
This option provides you with a series of local and remote Transport Settings that must be entered:
Local SFTP Server Settings
Specify the SFTP account name remote servers will use to connect to this SFTP server.
Local SFTP Account Name
Specify the username for an account that can be authenticated on connections to the SFTP server.