TNO cloud storage is the concept of having data (e.g. your personal backup) stored on a hosted service while minimizing the necessary trust (TNO: Trust No One). The idea is to have a host-proof hosted solution with verifiable software (open source).
- SpiderOak - A host-proof hosted solution with a cross-platform client (promised to release the source code).
- A guide to TNO cloud storage on Ubuntu with Ubuntu One (built-in support for host-proofing in Ubuntu One is requested in bug #375289 on Launchpad)