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S4 Alternatives

S4 is described as 'Amazon S3-based application of Least-Authority File System, or LAFS. LAFS free, open source cloud storage system with verifiable end-to-end security. It distributes your data across multiple servers' 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, Online / Web-based and Android. The best alternative is Nextcloud, which is both free and Open Source. Other great apps like S4 are Duplicati, ownCloud, IPFS and Seafile.

S4 alternatives are mainly Cloud Storage Services but may also be File Sync Tools or Online Backup Tools. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of S4.
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S4 iconS4
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  • Linux

S4 is an Amazon S3-based application of Least-Authority File System, or LAFS. LAFS is a free, open source cloud storage...

Learn more about S4

  1. Online backup for $7 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.

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  2. You should have full control over your data. We help you achieve that: a safe home for all your data. Secure, under your control and developed in an open, transparent and trustworthy way. We are Nextcloud.

    Simple and powerful file sync & share


  3. Duplicati is a backup client that securely stores encrypted, incremental, compressed backups on local storage, cloud storage services and remote file servers. The Duplicati project was inspired by Duplicity and had similar functionality until 2008.

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  4. ownCloud icon

    ownCloud

    • FreemiumOpen Source
    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Blackberry
    • Android Tablet
    • iPad
    • Self-Hosted
    • Software as a Service (SaaS)
    • Raspberry Pi
    • Cloudron

    Store your private pictures, documents, calendar and contacts on your ownCloud server at home, a rented VPS or use one of the public ownCloud providers.

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    ownCloud vs S4 opinions
    pros, cons and recent comments
    JohnFastman

    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.

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  5. IPFS icon

    IPFS

    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • BSD
    • Self-Hosted

    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.

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  6. 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.

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    Seafile vs S4 opinions
    pros, cons and recent comments
    JohnFastman

    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.

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  7. 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.

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    Spideroak One Backup vs S4 opinions
    pros, cons and recent comments
    JohnFastman

    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.

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  8. Online backup for $7 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.

    Screenshot
  9. Tresorit is the end-to-end encrypted file sync and sharing solution which safeguards confidential information by design. Unlike other public cloud vendors, Tresorit has no access to users’ files, which ensures maximum confidentiality.

    Access encrypted documents from any device and stay in sync with your team.
  10. Data Protection for SMBs with Cloud Backup.

    Desktop app. Works on Windows, OS X, and Linux.
Showing 10 of 29 alternatives