---
meta_title: "最高のプライベートで安全なクラウドストレージ プロバイダー - Privacy Guides"
title: クラウドストレージ
icon: material/file-cloud
description: Many cloud storage providers require your trust that they will not look at your files. これらはプライベートな選択肢です！
cover: cloud.webp
---

<small>Protects against the following threat(s):</small>

- [:material-bug-outline: パッシブ攻撃](basics/common-threats.md#security-and-privacy ""){.pg-orange}
- [:material-server-network:サービスプロバイダー](basics/common-threats.md#privacy-from-service-providers ""){.pg-teal}

Many **cloud storage providers** require your full trust that they will not look at your files. The alternatives listed below eliminate the need for trust by implementing secure end-to-end encryption.

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.

<details class="admonition info" markdown>
<summary>Looking for Nextcloud?</summary>

For more technical readers, Nextcloud is [still a recommended tool](self-hosting/file-management.md#nextcloud) 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.

</details>

## Proton Drive

<div class="admonition recommendation" markdown>

![Proton Drive logo](assets/img/cloud/protondrive.svg){ align=right }

**Proton Drive** is an encrypted cloud storage provider from the popular encrypted email provider [Proton Mail](email.md#proton-mail).

The initial free storage is limited to 2 GB, but with the completion of [certain steps](https://proton.me/support/more-free-storage-existing-users), additional storage can be obtained up to 5 GB.

[:octicons-home-16: Homepage](https://proton.me/drive){ .md-button .md-button--primary }
[:octicons-eye-16:](https://proton.me/drive/privacy-policy){ .card-link title="Privacy Policy" }
[:octicons-info-16:](https://proton.me/support/drive){ .card-link title="Documentation" }
[:octicons-code-16:](https://github.com/ProtonMail/WebClients){ .card-link title="Source Code" }

<details class="downloads" markdown>
<summary>Downloads</summary>

- [:simple-googleplay: Google Play](https://play.google.com/store/apps/details?id=me.proton.android.drive)
- [:simple-appstore: App Store](https://apps.apple.com/app/id1509667851)
- [:fontawesome-brands-windows: Windows](https://proton.me/drive/download)
- [:simple-apple: macOS](https://proton.me/drive/download)

</details>

</div>

The Proton Drive web application has been independently audited by Securitum in [2021](https://proton.me/community/open-source), but the brand new mobile clients have not yet been publicly audited by a third party.

## Tresorit

<div class="admonition recommendation" markdown>

![Tresorit ロゴ](assets/img/cloud/tresorit.svg){ align=right }

**Tresorit**は、2011年に設立された、スイスとハンガリーの暗号化クラウドストレージ プロバイダーです。 Tresoritはスイスの国営郵便局であるスイスポストが所有しています。

[:octicons-home-16: Homepage](https://tresorit.com){ .md-button .md-button--primary }
[:octicons-eye-16:](https://tresorit.com/legal/privacy-policy){ .card-link title="Privacy Policy" }
[:octicons-info-16:](https://support.tresorit.com){ .card-link title="Documentation" }

<details class="downloads" markdown>
<summary>Downloads</summary>

- [:simple-googleplay: Google Play](https://play.google.com/store/apps/details?id=com.tresorit.mobile)
- [:simple-appstore: App Store](https://apps.apple.com/app/id722163232)
- [:fontawesome-brands-windows: Windows](https://tresorit.com/download)
- [:simple-apple: macOS](https://tresorit.com/download)
- [:simple-linux: Linux](https://tresorit.com/download)

</details>

</div>

Tresorit has received a number of independent security audits:

- [2022](https://tresorit.com/blog/tresorit-receives-iso-27001-certification): ISO/IEC 27001:2013[^1] Compliance [Certification](https://certipedia.com/quality_marks/9108644476) by TÜV Rheinland InterCert Kft
- [2021](https://tresorit.com/blog/fresh-penetration-testing-confirms-tresorit-security): Penetration Testing by Computest
    - This review assessed the security of the Tresorit web client, Android app, Windows app, and associated infrastructure.
    - Computest discovered two vulnerabilities which have been resolved.
- [2019](https://tresorit.com/blog/ernst-young-review-verifies-tresorits-security-architecture): Penetration Testing by Ernst & Young.
    - 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. They concluded:

        > Test results found no deviation from Tresorit’s data confidentiality claims.

## Peergos

<div class="admonition recommendation" markdown>

![Peergos logo](assets/img/cloud/peergos.svg){ align=right }

**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, view, and edit their photos, videos, documents, etc.

Peergos secures your files with quantum-resistant E2EE and ensures all data about your files remains private. It is also [self-hostable](https://book.peergos.org/features/self).

[:octicons-home-16: Homepage](https://peergos.org){ .md-button .md-button--primary }
[:octicons-eye-16:](https://peergos.net/privacy.html){ .card-link title="Privacy Policy" }
[:octicons-info-16:](https://book.peergos.org){ .card-link title="Documentation" }
[:octicons-code-16:](https://github.com/Peergos/Peergos){ .card-link title="Source Code" }
[:octicons-heart-16:](https://github.com/peergos/peergos#support){ .card-link title="Contribute" }

<details class="downloads" markdown>
<summary>Downloads</summary>

- [:simple-googleplay: Google Play](https://play.google.com/store/apps/details?id=peergos.android)
- [:simple-github: GitHub](https://github.com/Peergos/web-ui/releases)
- [:fontawesome-brands-windows: Windows](https://peergos.org/download#windows)
- [:simple-apple: macOS](https://peergos.org/download#macos)
- [:simple-linux: Linux](https://peergos.org/download#linux)
- [:octicons-browser-16: Web](https://peergos.net)

</details>

</div>

Peergos is built on top of the [InterPlanetary File System (IPFS)](https://ipfs.tech), a peer-to-peer architecture that protects against [:material-close-outline: Censorship](basics/common-threats.md#avoiding-censorship ""){.pg-blue-gray}.

The client, server, and command line interface for Peergos all run from the same binary. Additionally, Peergos includes a [sync engine](https://book.peergos.org/features/sync) (accessible via the native apps) for bi-directionally synchronizing a local folder with a Peergos folder, and a [webdav bridge](https://book.peergos.org/features/webdav) to allow other applications to access your Peergos storage. You can refer to Peergos's documentation for a full overview of their numerous features.

Peergos was [audited](https://peergos.org/posts/security-audit-2024) in November 2024 by Radically Open Security and all issues were fixed. They were previously [audited](https://cure53.de/pentest-report_peergos.pdf) by Cure53 in June 2019, and all found issues were subsequently fixed.

## 規準

**私たちは、推薦するどのプロジェクトとも提携していません。**客観的に推薦できるよう、[標準となる規準](about/criteria.md)に加えて、一連の明確な要件を定めています。 プロジェクトを利用する前に、このリストをよく理解し、ご自身で調査を行って、そのプロジェクトがあなたにとって適切な選択かどうかをご確認ください。

### 最低要件

- Must enforce E2EE.
- Must offer a free plan or trial period for testing.
- Must support TOTP or FIDO2 multifactor authentication, or passkey logins.
- Must offer a web interface which supports basic file management functionality.
- Must allow for easy exports of all files/documents.

### 満たされることが望ましい基準

満たされることが望ましい基準には、このカテゴリーの完璧なプロジェクトに私たちが望むものを示しています。 私たちが推薦するプロジェクトは、この機能の一部または全部を含んでいないかもしれませんが、もし含んでいれば、このページで他のプロジェクトよりも上位にランクされるかもしれません。

- Clients should be open source.
- 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.
