How is DRG only 3 GB?

I'm intrigued by the claim that DRG, a decentralized storage network, is able to operate with just 3 GB of storage. How is this possible? Given the vast amounts of data that need to be stored and accessed securely across a decentralized network, how does DRG manage to keep its storage requirements so low? Is there a unique algorithm or data compression technique at play here? Or is there some other factor that allows DRG to operate efficiently with such minimal storage requirements? I'd love to understand the technical details behind this impressive feat.