Even if some servers go down, your data is still safe and available.
Easy access to previous revisions of your data.
Unlike most other storage providers, S4 offers verifiable end-to-end encryption.Learn more about how S4 works
Unlike other client-side-encryption services, S4 is free, open source software. Anyone can read the code and confirm that it doesn't have secret backdoors; you don't have to just take our word for it.
Unlike many of the popular online services, S4 does client-side encryption on every file. Your data is encrypted before it leaves your device. The server that stores your data can’t spy on your files even if it tries
What our users think about our service.
I was positively amazed about how easy it is to install and how well it works.
Wider deployment of this type of file storage system [LAFS] would have an immediate impact on the quality of modern data protection.
If you use only free/libre software, you control your local computing — but using the Internet raises other issues of freedom and privacy, which many network services don't respect. The Simple Secure Storage Service is an example of a network service that does respect your freedom and privacy.