S4 Alternatives

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.

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Alternatives list

  1. Nextcloud icon

    Nextcloud

     1159 likes
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    On-premises solution offering file sync, universal data access and collaboration through Nextcloud Files, Talk, and Groupware. Ensures secure, controlled data storage for enterprise with powerful privacy tools including encryption, fine-grained access, and a bug bounty.

    154 Nextcloud alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Self-Hosted
    • Snapcraft
    • F-Droid
    • Raspberry Pi
    • Cloudron
    • Docker Hub
    Simple and powerful file sync & share
     

    • Nextcloud is the most popular Web-based, Windows, Android & Mac alternative to S4.

    • Nextcloud is the most popular Open Source & free alternative to S4.

    • Nextcloud is Free and Open SourceS4 is Paid and Proprietary
    • Nextcloud is Privacy focused, Security-focused and CustomizableS4 is not according to our users
  2. Duplicati icon

    Duplicati

     352 likes
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    Duplicati stores encrypted, incremental backups with AES-256 encryption and GPG, compatible with Windows, Linux, MacOS. Supports cloud services like OneDrive, Google Drive, and includes a built-in scheduler, auto-updater. Run backups through a web interface or command line.

    134 Duplicati alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    Duplicati screenshot 1
     
  4. ownCloud icon

    ownCloud

     863 likes
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    Self-hosted option for secure file sync, sharing, calendars, contacts, and mail supporting mobile, desktop, web access and external storage, real-time collaboration, password-protected links, document editing, anti-virus scanning, and LDAP integration.

    221 ownCloud alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Blackberry
    • Android Tablet
    • iPad
    • Self-Hosted
    • Software as a Service (SaaS)
    • Raspberry Pi
    • Cloudron
    ownCloud screenshot 1
     
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    1
    Comments about ownCloud as an Alternative to S4
    John Fastman
    Positive
    0

    ownCloud can be hosted by someone else, but usually people host it themselves. In the first case, the storage is not unlimited; in the second case it is limited only by the size of the harddisk your server is using. ownCloud does not easily allow "zero-knowledge" encryption, so should be used with Duplicati (backup) or Cryptomator (sync) for results similar to S4.

    S4 Icon
    ownCloud icon

    • ownCloud is the most popular SaaS alternative to S4.

    • ownCloud is Freemium and Open SourceS4 is Paid and Proprietary
  5. Ad
    Screenshot
    Tresorit icon
    Tresorit

    End-to-end encrypted file synchronization and sharing on desktop and mobile, featuring admin controls, auditing, link-based sharing, two-factor authentication, offline access, granular permission management, and protection for se...

    https://tresorit.com
    Learn More
  6. IPFS icon

    IPFS

     175 likes
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    IPFS is a global, versioned, peer-to-peer filesystem. It combines ideas from Git, BitTorrent, Kademlia, SFS, and the web. It is like a single bittorrent swarm, exchanging git objects. IPFS provides an interface as simple as the HTTP web, but with permanence built in.

    69 IPFS alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    • Self-Hosted
    • Firefox
    IPFS screenshot 1
     
  7. Seafile icon

    Seafile

     193 likes
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    Open source cloud platform for organizations with self-hosting, device file synchronization, sharing, versioning, secure encrypted storage, admin controls, web access, audit logging, and support for desktop and mobile clients for secure collaboration.

    124 Seafile alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Self-Hosted
    • Software as a Service (SaaS)
    Seafile screenshot 1
     
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    1
    Comments about Seafile as an Alternative to S4
    John Fastman
    Positive
    0

    Seafile is more similar to Dropbox than to S4. It's a sync service hosted in Germany (Seafile.de) and uses an open source client (Seafile.com). S4 is a backup service only. They promise a sync folder but that's not yet available.

    S4 Icon
    Seafile icon
    • Seafile is Freemium and Open SourceS4 is Paid and Proprietary
    • Seafile is Privacy focusedS4 is not according to our users
  8. Spideroak One Backup icon

    Spideroak One Backup

     680 likes
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    SpiderOak provides an easy, secure and consolidated online backup, storage, access, sharing & sync tool for Windows, macOS, and Linux (Ubuntu, Debian & Fedora). SpiderOak offers a different approach to online backup, synchronization, and sharing.

    132 Spideroak One Backup alternatives

    Cost / License

    • Subscription
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    Spideroak One Backup screenshot 1
     
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    1
    Comments about Spideroak One Backup as an Alternative to S4
    John Fastman
    Positive
    0

    Spideroak is end-to-end encrypted (zero knowledge), like S4. It is cheaper and offers a Sync folder (S4 are planning one). However, with SpiderOak you don't get unlimited storage, which S4 does offer.

    S4 Icon
    Spideroak One Backup icon

    • Spideroak One Backup is the most popular commercial alternative to S4.

    • Spideroak One Backup is Paid and ProprietaryS4 is also Paid and Proprietary
    • Spideroak One Backup is Security-focusedS4 is not according to our users
  10. Tresorit icon

    Tresorit

     113 likes
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    End-to-end encrypted file synchronization and sharing on desktop and mobile, featuring admin controls, auditing, link-based sharing, two-factor authentication, offline access, granular permission management, and protection for sensitive workplace documents.

    108 Tresorit alternatives

    Cost / License

    • Subscription
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad
    Access encrypted documents from any device and stay in sync with your team.
     
  11. BackBlaze icon

    BackBlaze

     104 likes
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    Pioneering scalable cloud backup offers unlimited data protection and application storage with S3 compatibility, ensuring seamless data recovery and privacy compliance, backed by 24/7 support at one-fifth the cost of traditional solutions.

    120 BackBlaze alternatives

    Cost / License

    • Subscription
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    BackBlaze screenshot 1
     
  12. CrashPlan icon

    CrashPlan

     251 likes
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    Provides continuous, automated cloud backup and secure, scalable recovery for business servers, endpoints, Microsoft 365, and Google Workspace, protecting critical data from deletion, ransomware, and failure with compliance, threat detection, and easy management features.

    104 CrashPlan alternatives

    Cost / License

    • Pay once
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Software as a Service (SaaS)
    CrashPlan screenshot 1
     
  13. IDrive icon

    IDrive

     54 likes
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    Secure cloud backup supporting iPhone, Android, Windows, and more. Featuring quick backups, 256-bit encryption, data protection, and full remote management with file recovery and archiving options.

    128 IDrive alternatives

    Cost / License

    • Freemium (Subscription)
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • iPad
    • Linux
    IDrive screenshot 1
     
  14. Internxt Drive icon

    Internxt Drive

     68 likes
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    Open-source, privacy-focused cloud storage using zero-knowledge encryption and blockchain technology, provides secure file transfer, end-to-end encryption, free 10 GB plan, desktop and mobile support, full user control, and no data tracking or ads.

    164 Internxt Drive alternatives

    Cost / License

    • Freemium (Pay once or Subscription)
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    Internxt Drive screenshot 1
     
  15. OwnDrive icon

    OwnDrive

     81 likes
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    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. Our users have the ability to store, sync and share files, contacts, calendars...

    53 OwnDrive alternatives

    Cost / License

    • Freemium (Pay once)
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    Homepage 2013 (Currently in Beta)
     
12 of 26 S4 alternatives