What do you mean by “cloud space”? Is it on a cloud drive somewhere or my own computer?
Because if they want extra cloud space it’s cheaper and safer to just buy it from an established provider.
If they want to store their data on my computer, what guarantees do I have to offer in therms of availability and speed of access?
Do I have to keep my PC turned on at all times? What happens if I lose internet connection? Can I restart my pc after an update? Do I have to ensure redundancy? How do I compensate them on data loss?
If they don’t want to use a provider like Google, Microsoft or Dropbox, then why? Do they want to store something questionable or illegal?