Remote Engines allows you to run Data Integration Flows which use on-premises applications and databases. Outbound communication between Talend Integration Cloud and Remote Engines is fully secured as data is not staged.
Local to Cloud / Cloud to Local
Access to local data/applications (for example, an Excel or CSV file listing new customers) and upload it to another cloud application (for example, Marketo). In this case, Remote Engines are within the user's data center with access to the needed resources (local file system, databases, etc.) and the data ends up directly in the destination cloud application (like Marketo or Salesforce) without going through the Talend Integration Cloud application, as the communication is only outbound.
Local to Local
Access to local data/applications (for example, an Excel or CSV file listing new customers) and upload it to another local application (for example, a local SAP system). In this case, the data is transferred within the corporate network and the Talend Integration Cloud application only receives some metadata, ensuring that it stays inside the user's company network.
Customer Cloud to SaaS Cloud
Update cloud-based SaaS applications (for example, Salesforce) with the latest Map/Reduce results (for example, using Hive or HBase Query) and the customer information stored in the user's cloud application (for example, Amazon or Google Cloud). In this case, no local corporate network is involved and the Talend Integration Cloud application only receives some metadata.