A while back, I've tried building a solution that does encrypted storage with locally managed keys, with a cloud backup.
Unfortunately, it did not go to production: the majority of people are ok with sharing their digital artifacts with google, dropbox, advertising and insurance companies, and any other entities who manage to have an agreement with of hack into the cloud provider. (See, for example, how many people talk about google photos in this thread). The market for a truly secure digital archive is, in my opinion, too small.
Unfortunately, it did not go to production: the majority of people are ok with sharing their digital artifacts with google, dropbox, advertising and insurance companies, and any other entities who manage to have an agreement with of hack into the cloud provider. (See, for example, how many people talk about google photos in this thread). The market for a truly secure digital archive is, in my opinion, too small.
A prototype can be still seen at [0].
0: https://goryachev.com/products/secure-archive/index.html