Wow.. the geogram server was inactive this morning which is common because it isn't yet mature but this was the first time the error was due to lack of disk space.
40 GB of disk space have been used to hold about two months and 320 million radio messages from across the globe.
This means about 240 GB on current rates to hold a year worth of messages. After geogram is fully running this value should be around 1 TB per year, still quite feasible with common hardware.