Whenever I read about fusion, I get reminded of a note in the sci-fi book trilogy The Night's Dawn. In that story, the introduction of cheap fusion energy had not cured global warming on Earth but instead sped it up with all the excess heat from energy-wasting devices.
What matters is not what we don't have, but how we manage that which we do have.
There are several challenges, not least of which is storage. We have considerable leakage in most of our current helium storage solutions on earth because it’s so light. Our national reserves are literally in underground caverns because it’s better than anything we can build. Space just means any containment system will need to work in a wider range of pressure/temperatures.
Doing some googling yields an estimated cost of about $25,000 per kg. I can see why extraction from wells is preferred.
Non-helium hard drives are basically limited by their bearing spin hours. If one only spins a few hours a week, it'll probably run for decades. Not so with helium.