OpenStack platform, designed to deploy private and public cloud-services. Currently, the project is developing two products: distributed, fault-tolerant and highly reliable storage of objects OpenStack Object Storage and tools OpenStack Compute, which allows you to automatically create and manage the work of large groups of VPS servers. "
As it seems to me, its openness removes one of the frightening minuses of SaaS and clouds - binding to the supplier (vendor lock in). In addition, part of the repository for the relevant information can be placed at. A transcendental part to use for archives.