Efficient Software Defined Storages are much more flexible and cost-effective than conventional storage systems. Therefore, they enable an on-premises infrastructure that can be even when all additional costs are included way cheaper in comparison to the public cloud solutions of the SaaS service providers.
All solutions have their advantages. Private cloud solutions offer higher data security, supply further control options and provide more flexibility by customizing special requirements and use cases.
On the other hand, the main argument for the public cloud is usually the supposedly lower costs. However, a precise comparison between current SaaS offerings and selected self-hosted solutions indicate that being well aware of the requirements and not being in need of unlimited storage, the choice of a private cloud may even be a significantly cheaper solution.