The method of promotion
Sorry for the translator, I do not speak English well.
Free secure storage in the cloud of their files in exchange for the excessively provided disk space. I like many people use cloud storage to protect against the loss of personal photo documents. In doing so, there is a lot of unused disk space. Option when the user allocates his disk in excess for siacoin in exchange for free stores files that do not want to lose. For the user this is a zero-waste entry, for siacoin popularization, and in the future, someone will benefit from a paid expansion of the cloud.
This is a possible method of attracting users from free cloud services.