If these alternatives do not fit your needs, we suggest you look into using encryption software like [Cryptomator](encryption.md#cryptomator-cloud) with another cloud provider. Using Cryptomator in conjunction with **any** cloud provider (including these) may be a good idea to reduce the risk of encryption flaws in a provider's native clients.
Nextcloud is [still a recommended tool](productivity.md) for self-hosting a file management suite, however we do not recommend third-party Nextcloud storage providers at the moment, because we do [not recommend](https://discuss.privacyguides.net/t/dont-recommend-nextcloud-e2ee/10352/29) Nextcloud's built-in E2EE functionality for home users.
**Proton Drive**は、人気の暗号化電子メールプロバイダーである[Proton Mail](email.md#proton-mail)が提供する、スイスの暗号化クラウドストレージ プロバイダーです。 The initial free storage is limited to 2GB, but with completion of certain steps, additional storage can be obtained up to 5GB.
- This review analyzed the full source code of Tresorit and validated that the implementation matches the concepts described in Tresorit's [white paper](https://prodfrontendcdn.azureedge.net/202208011608/tresorit-encryption-whitepaper.pdf).
- Ernst & Young additionally tested the web, mobile, and desktop clients: "Test results found no deviation from Tresorit’s data confidentiality claims."
They have also received the Digital Trust Label, a certification from the [Swiss Digital Initiative](https://www.efd.admin.ch/efd/en/home/digitalisierung/swiss-digital-initiative.html) which requires passing [35 criteria](https://digitaltrust-label.swiss/criteria) related to security, privacy, and reliability.
**Peergos** is a decentralized protocol and open-source platform for storage, social media, and applications. It provides a secure and private space where users can store, share, and view their photos, videos, documents, etc. Peergos secures your files with quantum-resistant end-to-end encryption and ensures all data about your files remains private. It is built on top of [IPFS (InterPlanetary File System)](https://ipfs.tech).
Peergos is primarily a web app, but you can self-host the server either as a local cache for your remote Peergos account, or as a standalone storage server negating the need to register for a remote account and subscription. The Peergos server is a `.jar` file, which means the Java 17+ Runtime Environment ([OpenJDK download](https://azul.com/downloads)) should be installed on your machine to get it working.
Running a local version of Peergos alongside a registered account on their paid, hosted service allows you to access your Peergos storage without any reliance on DNS or TLS certificate authorities, and keep a copy of your data backed up to their cloud. The user experience should be the same whether you run their desktop server or just use their hosted web interface.
Peergos was [audited](https://cure53.de/pentest-report_peergos.pdf) by Cure53 in September 2019, and all found issues were subsequently fixed.
Also, the Android app is not available but it is [in the works](https://discuss.privacyguides.net/t/peergos-private-storage-sharing-social-media-and-application-platform/11825/25). The current workaround is to use the mobile [PWA](https://peergos.net) instead.
- Clients should be audited in their entirety by an independent third-party.
- Should offer native clients for Linux, Android, Windows, macOS, and iOS.
- These clients should integrate with native OS tools for cloud storage providers, such as Files app integration on iOS, or DocumentsProvider functionality on Android.
- Should support easy file-sharing with other users.
- Should offer at least basic file preview and editing functionality on the web interface.
[^1]: [ISO/IEC 27001](https://en.wikipedia.org/wiki/ISO/IEC_27001):2013 compliance relates to the company's [information security management system](https://en.wikipedia.org/wiki/Information_security_management) and covers the sales, development, maintenance and support of their cloud services.
