Сloud storage secure by design, not by obscurity.
All files are encrypted by client software or in browser before any data leaves computer.
We can't even possibly know what is uploaded – only user has the key.
* User-controlled AES-256 encryption
* Client-side de-duplication – similar files are cheap.
* Client-side compression
* Backups with unlimited history, instantly accessible anytime
* Time travel - snapshot entire directories and drives