https://www.dropbox.com/acceptable_use https://www.dropbox.com/acceptable_use use the Services to back up, or as infrastructure for, your own cloud services;

https://www.dropbox.com/acceptable_use https://www.dropbox.com/acceptable_use use the Services to back up, or as infrastructure for, your own cloud services; use the storage space provided by the Services as the basis for cryptographic proof-of-space or proof-of-storage, or any similar proof system;