Alternatives to S4

Nextcloud

Nextcloud is an open source, self-hosted file sync and share solution. It provides users with the ability to store, sync, access, and share their data across multiple devices and platforms. With Nextcloud, users can securely store, share, and sync files with other users. It also ...

ownCloud

ownCloud is an open source cloud storage platform that provides users with a secure and private way to store, sync, and share files, documents, and other data across multiple devices and platforms. It lets you access your data from any device or platform, and you can use it to sh...

ownCloud puede ser alojado por alguien más, pero generalmente la gente lo aloja por sí misma. En el primer caso, el almacenamiento no es ilimitado; en el segundo caso, está limitado solo por el tamaño del disco duro que usa su servidor. ownCloud no permite fácilmente el cifrado de "conocimiento cero", por lo que debe usarse con Duplicati (copia de seguridad) o Cryptomator (sincronización) para resultados similares a S4.

JohnFastman

Duplicati

Duplicati is a free, open source, cross-platform backup and sync application designed to protect your data from loss. It uses secure encryption and supports multiple cloud storage services including Amazon S3, Backblaze, Dropbox, Google Drive, Microsoft OneDrive, and many more. W...

SpiderOak

SpiderOak is an online backup, sync, and storage solution. It is designed to keep your data safe and secure while providing you with easy access and sharing capabilities. SpiderOak encrypts all files, ensuring that only you can access your data. It also provides a secure environm...

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

JohnFastman

IPFS

InterPlanetary File System (IPFS) is an open source, peer-to-peer distributed file system that seeks to connect all computing devices with the same system of files. It allows users to not only share and distribute files and data, but also to explore and access them from anywhere ...

Seafile

Seafile is a secure, distributed, open-source file synchronization and sharing platform. It allows you to easily back up and sync your data across multiple devices and platforms, including Windows, Mac, Linux, iOS, Android and web. Seafile offers a number of features to make bac...

Seafile is more similar to Dropbox than to S4. It is 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 it is not yet available.

JohnFastman

CrashPlan PRO

CrashPlan PRO is an online backup and sync application designed to provide businesses and organizations with reliable, secure, and automated backup and recovery services. It allows users to create and manage local, offsite, and cloud-based backups for their data, as well as set u...

Discontinued Current subscribers were informed last year that CrashPlan Home will be discontinued in October 2018. The service has recommended users sign up for another home service such as Carbonite, or for CrashPlan's much more expensive business plan.

Guest

Tresorit

Tresorit is a cloud-based backup and sync application that allows users to securely store, share and sync files across multiple devices. It is a zero-knowledge storage solution, meaning that all files are encrypted before they leave the user's device, making them inaccessible eve...

BackBlaze

BackBlaze is a cloud backup and sync application designed to provide secure, automated, and reliable backup of your important data. It allows you to backup your files and folders to the cloud, with the ability to access them from anywhere. BackBlaze is available for both Windows ...

OwnDrive

OwnDrive is an online storage, backup, and sync application that allows users to store, share, and access their files from anywhere, anytime. It is a secure and reliable solution for backing up important data and documents. With OwnDrive, users can store and access their data on ...

CmisSync

CmisSync is an open source application that allows users to synchronize documents and files between a remote server and their local computer. It supports both traditional file-level synchronization and content-level synchronization, meaning that users can access the same document...

IDrive

IDrive is an online backup and sync service that allows users to securely store and access their data from anywhere. It works on both Windows and Mac computers, as well as mobile devices. With the IDrive app, users can back up their files and folders to the cloud with just a few ...

Ind.ie Pulse

Ind.ie Pulse is a cloud-based application that allows users to securely backup and sync their data across multiple devices. It provides a secure and private way to store and share personal information and files from any device, no matter where it is located. With Ind.ie Pulse, us...

Discontinued As announced at https://ind.ie/blog/focus/, Pulse will no longer be supported, but you can still download it from the official website and use it.

Guest

TeamDrive

TeamDrive is a cloud-based backup and sync application that enables users to store, manage, and share their digital data securely across all of their devices. It allows users to securely back up and synchronize their data with a secure and encrypted remote server. TeamDrive also ...

Muonium

Muonium is an online backup and sync application that provides users with a secure, reliable, and easy-to-use solution for backing up and synchronizing their important files and data. Muonium’s automatic backup feature provides users with the peace of mind that their files are sa...

Nubo

Nubo is an automated backup and sync application designed to make it easier to keep your data safe and secure. It allows users to securely store files and documents in cloud-based storage and automatically sync them across multiple devices. It also provides users with an easy way...

Carbonite

Carbonite is a cloud-based backup and sync application that allows users to securely store, protect and access data from anywhere. It is designed to provide users with a secure, off-site storage system for their important files, documents, videos, photos and more. Carbonite also ...

X Cloud

X Cloud is a cloud-based backup and sync application that allows users to securely store, access, and share their data. It provides users with a secure, reliable platform to store and back up their data, as well as synchronize and share it with other devices. X Cloud also allows ...

Wasabi

Wasabi is a cloud storage and syncing application that allows users to store, backup, and sync their data across multiple devices. It is designed to provide a secure, reliable, and effortless way to keep data safe and accessible from anywhere. It offers a secure storage solution ...

FileAgo

FileAgo is an online backup and sync application that helps you keep all your files safe, secure, and available from anywhere. The application is available for Windows, Mac, and mobile devices, so you can access your data from any device. It offers file storage, sharing, and coll...

S4

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Alternatives