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 5 S4 Alternatives

support-for-webdav filter is active.

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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
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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
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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
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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
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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

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S4

Links to official S4 sites

Features

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The Best 5 S4 Alternatives

ownCloud

Nextcloud

Duplicati

OwnDrive

Tresorit

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