how many can they store?
https://www.youtube.com/watch?v=PoOJggESR8o
Current US debt is almost 34 trillions? https://www.usdebtclock.org/
1 KByte = 8 * 1000 = 8 000 bits
1 MByte = 8000 * 1000 = 8 000 000 bits
1 GByte = 8000000 * 1000 = 8 000 000 000 bits
1 TByte = 8000000000 * 1000 = 8 000 000 000 000 bits
2 TBytes = 8000000000000 * 2 = 16 000 000 000 000 bits
All values approximate.