S4

S4 = Simple Secure Storage Service. S4 is Least Authority's secure off-site backup system for individuals and businesses.

Commercial
Linux

s4 is an amazon s3based application of leastauthority file system, or lafs. lafs is a free, open source cloud storage system with verifiable endtoend security. it distributes your data across multiple servers. even if some of the servers fail or are taken over by an attacker, the entire filesystem continues to function correctly, preserving your privacy and security.

what is leastauthority backup good for?

it is good for securely backing up your data offsite. the "tahoe backup" command inspects your local filesystem for files that have changed since the last time you ran it. it uploads each file that has changed and it creates a directory in lafs to hold the current "snapshot"—the current version of each of the files. you can browse or access old versions just by browsing the old snapshot directories.where is my data stored?

your data, encrypted, is stored on amazon's simple storage service (s3), which is a convenient, reliable, and widely understood platform for storage.

data is replicated according to the following policy decribed in amazon's overview of security processes:

data stored in amazon s3, amazon simpledb, or amazon elastic block store (ebs) is redundantly stored in multiple physical locations as part of normal operation of those services and at no additional charge. amazon s3 and amazon simpledb provide object durability by storing objects multiple times across multiple availability zones on the initial write and then actively doing further replication in the event of device unavailability or detected bitrot.

how much do the services cost?

s4 costs $25 per month for unlimited storage, for personal use.

Links to official S4 sites

Features

Client side encryption End to end encryption Zero Knowledge Access Control

The Best 19 S4 Alternatives

724 Like

ownCloud

A safe home for all your data – Access & share your files, calendars, contacts, mail & more from any device, on your terms.

Open Source Freemium Mac OS X Windows Linux Android iPhone Android Tablet iPad Blackberry

File sync Share files Built in RSS reader Calendar integration Autotagging Built in Note Taker Image Preview Support for WebDAV
258 Like

CrashPlan PRO

CrashPlan lets you automatically back up your hard drive to another computer. The program offers secure cloud storage, in addition to local backups, and continuous, minute-by-minute backup. All backed-up files are encrypted.

Commercial Mac OS X Windows Linux Android iPhone iPad Web

Unlimited storage Multiple languages AES encryption File Versioning Automatic Backup Encrypted backups
207 Like

Nextcloud

A safe home for all your data – Access & share your files, calendars, contacts, mail & more from any device, on your terms.

Free Open Source Windows Linux Android iPhone Android Tablet iPad Web Mac

Built in Download Manager Extensible by Plugins/Extensions Privacy focused Security focused File sync Unlimited storage Video calling MarkDown support Sync Contacts Real time collaboration Calendar integration Support for WebDAV Self Hosted Feature End to end encryption Mobile friendly CalDAV CardDAV Contacts and calendar sync Integrated Email Client Shared calendars Storage control Two factor authentication
181 Like

Duplicati

Duplicati is the only portable backup program, able to send backups in encrypted form to another computer or SkyDrive using one of several methods (WebDAV, FTP, SFTP/SCP/SSH, Amazon S3, Rackspace CloudFiles, USB disk, Windows network...

Free Open Source Mac OS X Windows Linux

Cloud sync Multiple languages Support for WebDAV File Versioning Support for SFTP Automatic Backup Backup to Google Drive Encrypted backups Incremental backup Schedule Backup Extremely Secure Guided configuration Retention Schedule
128 Like

TeamDrive

Sync & share your files easily & securely with 256 bit AES end-to-end encryption, using the award-winning TeamDrive utilizing cloud storage or your own server! Nowadays especially, security is key and we are on the forefront of...

Free Personal Mac OS X Windows Linux Android iPhone Android Tablet iPad

File sync Reliable Real time collaboration End to end encryption Encrypted backups Encrypted sync
125 Like

Seafile

Seafile is a professional open source cloud storage platform for organizations. It has complete file syncing and sharing features, reliable file storage and advanced privacy protection feature.

Freemium Mac OS X Windows Linux Android iPhone Android Tablet iPad Web Mac

File sync Team Collaboration Development API File Versioning Encrypted sync Install Syslinux Support for Amazon S3 Sync Network Drive
76 Like

OwnDrive

OwnDrive is a security and privacy oriented cloud storage service that gives access to people’s data anywhere, anytime and from any device. OwnDrive makes storing, syncing and sharing of data easy.

Freemium Mac OS X Windows Linux Android iPhone iPad Web

Integrated PDF Viewer Built in player Built in RSS reader Support for WebDAV CalDAV Built in Image viewer
74 Like

IPFS

IPFS is a global, versioned, peer-to-peer filesystem. It combines good ideas from Git, BitTorrent, Kademlia, SFS, and the web. It is like a single bittorrent swarm, exchanging git objects.

Free Open Source Windows Linux BSD Mac Self-Hosted

Decentralized Peer To Peer Distributed
71 Like

BackBlaze

Online backup for $5 month unlimited space. Backblaze backup encrypts and uploads all your data – no questions asked. No picking files. No digging through folders. Your data is backed up online to our datacenters, so nothing can touch it.

Commercial Mac OS X Windows

Unlimited storage Encrypted sync Incremental backup
70 Like

Tresorit

Tresorit is a security solution for distributed storage systems, and with it a group of users can share secure content without trusting any administrator or third party provider.

Commercial Mac OS X Windows Linux Android iPhone Android Tablet iPad Windows Phone

File sync Selective synchronization Cloud sync Real time collaboration Support for WebDAV File Versioning End to end encryption Integrated File Sharing Two factor authentication Outlook integration Encrypted backups Encrypted sync Duplicate Files Finder Encrypted links Encrypted photo upload Location based Zero Knowledge
44 Like

IDrive

Get 5 GB of full featured Online Backup for free. Features include Automatic Backup, True Archiving, Versioning, Continuous Backup, Mapped Drive Backup and Web-based Backup Management.

Freemium Mac OS X Windows Android iPhone iPad Web

End to end encryption Mobile friendly Support for MS SQL Server Encrypted backups Zero Knowledge
30 Like

Ind.ie Pulse

Pulse is a free (as in freedom), secure, and distributed file synchronisation engine in Go and Swift.

Free Open Source Windows Linux BSD Mac OpenSolaris

Portable File sync Works Offline Selective synchronization Decentralized
20 Like

CmisSync

CmisSync synchronizes files to/from any enterprise file server. It looks very much like Dropbox, but synchronizes with an existing file server instead of synchronizing with Dropbox's server.

Free Open Source Mac OS X Windows Linux

File sync Cloud sync On premises software
16 Like

Carbonite

Unlimited online backup for one flat fee. Free trial, no credit card required. Secure and encrypted for your privacy. Easy, on-demand restore. Securely backup your photos, emails, financial documents, music and more over internet.

Commercial Mac OS X Windows Android iPhone iPad Web Blackberry
2 Like

Muonium

Muonium is a fully open source, encrypted, and democratic cloud.

Free Open Source Web
0 Like

Wasabi

Storage made simple. Faster than Amazon's S3. Less expensive than Glacier.

Commercial
0 Like

Wasabi Hot Storage

Wasabi is the hot storage company. We’re storage experts. We only do cloud storage, but we do it faster, cheaper, and more securely than anyone. Our mission is to make...

Commercial Web
0 Like

Nubo

Nubo is a self-hosted file sharing application. It currently runs on macOS and Linux. Support for Windows is expected soon. It consists of two applications: - A...

Free Open Source Self-Hosted

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S4

Links to official S4 sites

Features

Categories

Tags

The Best 19 S4 Alternatives

ownCloud

CrashPlan PRO

Nextcloud

Duplicati

TeamDrive

Seafile

OwnDrive

IPFS

BackBlaze

Tresorit

IDrive

Ind.ie Pulse

CmisSync

Carbonite

Muonium

Wasabi

Wasabi Hot Storage

Nubo

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