A petabyte of flash memory consumes several hundred watts and is susceptible to damage from particle radiation. A cube shape allows compounding damage. Perhaps

A petabyte of flash memory consumes several hundred watts and is susceptible to damage from particle radiation. A cube shape allows compounding damage. Perhaps several Starships could be put in a medium Earth orbit, filled (or refilled over several missions) with a liquid for radiation shielding. The shape of the data storage array is decided such that one linear event cannot strike all of three redundant devices.