S4 is described as '= Simple Secure Storage Service. S4 is Least Authority's secure off-site backup system for individuals and businesses' and is an app in the backup & sync category. There are more than 25 alternatives to S4 for a variety of platforms, including Mac, Windows, Linux, Web-based and Android apps. The best S4 alternative is Nextcloud, which is both free and Open Source. Other great apps like S4 are Duplicati, ownCloud, IPFS and Seafile.
e2ee-cloud is a open source, self-hosted, end-to-end encryption software. You can upload and download files in your browser. All files and folders will be encrypted before upload and decrypted after download.
Backer is a visual front end to the rsync command. It allows the user to select multiple folders and back them up to multiple locations. It stores your backup settings for you so that all your backups can be run easily using a single button click.
Pulse, officially-sanctioned fork of Syncthing , is a free, secure, and distributed file synchronisation engine.
Securely syncs files and folders to your enterprise file server (on-premise or private cloud), rather than to a public cloud.
Single-file PHP app that can be dropped into any folder, instantly creating a gallery of files and folders.
TeamDrive offers the missing link many other Synch&Share softwares lack. With the highest security standards TeamDrive becomes essential when sensitive data is concerned. Via a client users are able to transfer and share data.
Carbonite offers all the tools necessary for protecting data from the most common forms of data loss, including ransomware, accidental deletions, hardware failures and natural disasters. From automated computer backup to comprehensive protection for physical and virtual server...
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.
Nubo is a self-hosted file sharing application. It runs on macOS, Linux and Windows (64-bit versions only).
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.
FileAgo is a easy and highly secure self-hosted file storage and collaboration platform for companies and teams. Compared to other solutions, FileAgo is an attempt to tackle the collaboration part in a slightly different matter.
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