DPI exports statistics on traffic volumes (considering protocols and directions or autonomous systems) in a standard format netflow5. Therefore you can use any netflow collector and any tools to analyse netflow. We suggest to install NFSEN as a free alternative, with extensions to build reports by protocols and directions.
You shall need a computer with VEOS or higher installed. The required disk space is from 250 MB to 1.5 GB per each day. It depends on configuration. The computer must have at least 1 GB of RAM.