S4 = Simple Secure Storage Service. S4 is Least Authority's secure off-site backup system for individuals and businesses.
Cost / License
- Paid
- Proprietary
Platforms
- Linux


Tresorit is described as 'End-to-end encrypted file sync and sharing with secure workspace, robust permission management, two-factor authentication, and mobile offline access' and is a very popular Cloud Storage service in the backup & sync category. There are more than 100 alternatives to Tresorit for a variety of platforms, including Web-based, Windows, Android, Mac and iPhone apps. The best Tresorit alternative is Nextcloud, which is both free and Open Source. Other great apps like Tresorit are Cryptomator, Filen, Proton Drive and Koofr.
S4 = Simple Secure Storage Service. S4 is Least Authority's secure off-site backup system for individuals and businesses.


Everabyte provides secure, encrypted SaaS cloud storage and next-generation cybersecurity services — built to ensure data sovereignty, privacy, and resilience for modern organizations.
Syncwerk is a Germany-based syncing application similar to but more flexible than Dropbox. It uses an open source client that allows various folders to be synced and, optionally, encrypted to restrict access.
Synology C2 synchronizes data across all your devices, such as computers, mobile devices, or other Synology NAS. Build a private cloud and ensure files are readily available when and where you need them.




BooleBox is the most reliable Data Protection Platform on the market: archive, edit and share your data with ease, using a rigorous military encryption system.




With Bdrive, the highly secure cloud computing technology "Made and Hosted in Germany" from Bundesdruckerei, which offers products for the public, private and non-profit sectors, data is stored, exchanged and processed at the highest security level.
Total Drive offers a cloud-based platform prioritizing file safety with Neverlost technology. Enjoy automatic backup, ransomware protection, seamless sync, and intuitive management. Share files securely with controlled access and protect memories in shared family albums easily.




Zaclys provides easy and secure cloud online storage and synchronization based on the ownCloud free and open-source solution.

GS RichCopy 360 is the ONLY file copy utility that utilizes its own proprietary Multi-Threading technology that uses all available logical cores in the system.




With Drive File Stream, you stream your Drive files directly from the cloud to your Mac or PC, freeing up disk space and network bandwidth.


Intelligent file sharing and sensitive documents management platform that solves critical communications pain points. Copa reduces risks for human errors, providing supreme protection and collaboration capabilities, without compromising on usability.
EDS can utilize all the free disk space on your company's computers and laptops. Create your own private cloud storage by connecting them. You can upload, share and retrieve your files through the web interface.


