Universal Containers is in the process of testing their integration between salesforce and their on-premise...

The fastest approach to spin off a sandbox with up to 10,000 records in each object for testing the integration performance is to spin off a partial copy sandbox using a sandbox template with all the objects required for testing the integration. A partial copy sandbox can copy up to 10,000 records per object using a sandbox template that specifies the objects and fields to copy. A partial copy sandbox can also copy the metadata and the configuration settings from the production org. A developer pro sandbox, a development sandbox, or a full copy sandbox may not be able to copy enough data for testing the integration performance, as they have lower data storage limits. A developer pro sandbox and a development sandbox can only copy 1 GB of data, while a full copy sandbox can only copy 5 GB of data. A full copy sandbox may also take longer to spin-off, as it copies all the data and metadata from the production org.