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 3 S4 Alternatives

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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
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
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

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S4

Links to official S4 sites

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The Best 3 S4 Alternatives

Nextcloud

TeamDrive

Tresorit

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