According to Decrypt, the space occupied by archive nodes running the Ethereum blockchain has now grown to more than 4 TB, almost doubling in a year. This value represents the total amount of data that the user needs to download when running the archive node. These archive nodes store a complete snapshot of the Ethereum blockchain, including all transaction records that have occurred, which is different from a typical full node, which only records the ledger of verified transactions. Although most Ethereum clients choose to store only the necessary blockchain data, the problem of Ethereum's state inflation has yet to be resolved. Note: Archive nodes are not necessarily necessary, because complete nodes have copies of all transactions, but they are very useful for certain tasks, such as finding out the balance of Ethereum addresses at a certain point in time.