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S4 Alternatives

S4 Alternatives

S4

S4 is an Amazon S3-based application of Least-Authority File System, or LAFS. LAFS is a free, open source cloud storage system with verifiable end-to-end 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 Least-Authority Backup good for?

It is good for securely backing up your data off-site. 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 bit-rot.

How much do the services cost?

S4 costs $25 per month for unlimited storage, for personal use.

Best S4 Alternatives for Web

Looking for the best programs similar to S4? We reviewed our top picks below. Let's see if there are any S4 alternatives that work on your platform.

Spideroak One Backup

Spideroak One Backup

CommercialMacWindowsLinuxWebAndroidiPhoneiPadXfce

SpiderOak provides an easy, secure and consolidated online backup, storage, access, sharing & sync tool for Windows, Mac OS X, and Linux (Ubuntu, Debian &...

Features:

  • End-to-End Encryption
  • Encrypted backups
  • File Versioning
  • Encryption
  • Incremental backup
  • Automatic Backup
  • Backup
  • Cloud Storage
  • Folder sync
  • Works Offline
  • Real-time backup
  • Security focused
  • Selective synchronization
  • Unlimited storage
Nextcloud

Nextcloud

FreeOpen SourceMacWindowsLinuxWebAndroidiPhoneAndroid TabletiPadSelf-HostedF-DroidCloudron

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

Features:

  • Privacy focused
  • Calendar integration
  • Sync Contacts
  • File-sync
  • Self-hosted in intranet or private cloud
  • Two factor authentication
  • Cloud sync
  • Ad-free
  • Customizable
  • On-premises software
  • Security focused
  • CalDAV
  • End-to-End Encryption
  • Integrated Email Client
  • Integrated File Sharing
  • Mobile friendly
  • Multi-platform support
  • Calendar Sync
  • Support for ActivityPub
  • Built-in RSS reader
  • Collaborative Text Editor
  • Custom applications
  • Extensible by Plugins/Extensions
  • Federated Cloud
  • File sharing
  • LDAP Services
  • Openstack swift integration
  • Secure File Sharing
  • Sync notes
  • Video calling
  • Support for WebDAV
  • Auto Updates
  • Bookmark organization
  • Built-in Download Manager
  • Built-in Note Taker
  • CardDAV
  • Cloud Storage
  • Sync Contacts
  • Cross-platform
  • Support for Docker
  • Encryption is optional
  • Extensibility
  • Fast motion
  • File management
  • File Tagging
  • Hostable
  • In built video player
  • Integration
  • Keepass integration
  • LDAP support
  • LibreOffice Integration
  • Local server
  • Local Storage
  • MarkDown support
  • Modular extensions
  • Music Player
  • News aggregator
  • Notetaking
  • OCR
  • One Time Passwords
  • Onlyoffice integration
  • Permission system
  • Photo synchronization
  • Privacy Protected
  • Real time collaboration
  • Real-Time Synchronization
  • Security & Privacy
  • Large File Transfer
  • Shared calendars
  • Social feed
  • Storage control
  • Sync across Devices
  • Sync phone location
  • Sync SMS
  • Tablet support
  • Task time tracking
  • Team Collaboration
  • Two-Step verification
  • 2 way sync
  • Unlimited private repos
  • Unlimited storage
  • Unlimited users
  • Video calling
CrashPlan

CrashPlan

CommercialWindowsWeb

Automatic Data Loss Protection for Your Small Business $10 USD per month per computer. Never worry about losing business-critical data again. CrashPlan® for...

Features:

  • Encrypted backups
  • Backup
  • Incremental backup
  • AES encryption
  • Automatic Backup
  • File Versioning
  • Multiple languages
  • Unlimited storage
  • Version and Source control
Seafile

Seafile

FreemiumOpen SourceMacWindowsLinuxWebAndroidiPhoneAndroid TabletiPadSelf-Hosted

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

Features:

  • File-sync
  • File Versioning
  • Development API
  • Encrypted sync
  • File sharing
  • Install Syslinux
  • Isolated file libraries
  • Support for Amazon S3
  • Sync Network Drive
  • Team Collaboration
  • Virtual hard drive
OwnDrive

OwnDrive

FreemiumMacWindowsLinuxWebAndroidiPhoneiPad

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...

Features:

  • Built-in Image viewer
  • Built-in player
  • Built-in RSS reader
  • CalDAV
  • Cloud Storage
  • Contacts
  • File sharing
  • Integrated PDF Viewer
  • Support for WebDAV

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