Run your enterprise on a cell phone?
That 8.4 GB figure in the diagram above represents the dynamic data in the enterprise -- open orders, current-year transactions and anything related to current-fiscal-year results. That amount is small enough to run on a smartphone, Plattner pointed out. It's not that you actually would do that, but the idea is that you don't need much of a server and storage footprint, with in-memory technology, as compared to conventional apps, with their many copies of data.
That's the theory anyway, but it's notable what SAP last year added a store-to-disk option for "warm" and archival data, as opposed to the hot data that's managed in memory.