You display and modify RiOS data store settings under Optimization > Data Replication: Data Store. This page is typically used to enable RiOS data store encryption and synchronization.

RiOS appliances transparently intercept and analyze all of your WAN traffic. TCP traffic is segmented, indexed, and stored as segments of data, and the references representing that data are stored on the RiOS data store within appliances on both sides of your WAN. After the data has been indexed, it is compared to data already on the disk. Segments of data that have been seen before are not transferred across the WAN again; instead a reference is sent in its place that can index arbitrarily large amounts of data, thereby massively reducing the amount of data that needs to be transmitted. One small reference can refer to megabytes of existing data that has been transferred over the WAN before.