2026年版 OneDriveの代替ツール

OneDriveから乗り換える理由

TLDR

Syncクライアントが不安定になりがち — コンフリクトファイルや謎の同期エラーが今もパワーユーザーを悩ませる

OneDrive free: 5 GB free | easy learning curve

Google Drive

15 GB free (shared with Gmail and Photos)

何が違うのか: Anyone already in the Google ecosystem who wants seamless file storage tied to Docs, Sheets, and Gmail

料金比較: OneDrive: Microsoft 365 Basic $1.99/mo (100 GB) | Google Drive: Google One 100 GB $1.99/mo

Deep Google Workspace integrationReal-time collaboration on Docs/Sheets/SlidesPowerful search across files
OneDrive vs Google Driveを比較

Dropbox

2 GB free

何が違うのか: Freelancers and small teams who need reliable file sync, sharing, and large file transfers

料金比較: OneDrive: Microsoft 365 Basic $1.99/mo (100 GB) | Dropbox: Plus $11.99/mo (2 TB)

Smart Sync for disk space managementPaper for collaborative docsTransfer large files up to 100 GB
OneDrive vs Dropboxを比較

Box

10 GB free (personal)

何が違うのか: Enterprises that need bulletproof compliance, audit trails, and governance for regulated industries

料金比較: OneDrive: Microsoft 365 Basic $1.99/mo (100 GB) | Box: Business $15/user/mo

Enterprise-grade security and complianceBox Sign for e-signaturesWorkflow automations
OneDrive vs Boxを比較

pCloud

10 GB free

何が違うのか: Privacy-focused users who want a one-time lifetime payment instead of monthly subscriptions forever

料金比較: OneDrive: Microsoft 365 Basic $1.99/mo (100 GB) | pCloud: Premium 500 GB $49.99/year

Lifetime plan optionClient-side encryption (paid add-on)Built-in media player
OneDrive vs pCloudを比較

Sync.com

5 GB free

何が違うのか: Privacy-first teams that want zero-knowledge encryption included by default with no extra cost

料金比較: OneDrive: Microsoft 365 Basic $1.99/mo (100 GB) | Sync.com: Teams Standard $6/user/mo (1 TB)

End-to-end encryption by defaultZero-knowledge privacyHIPAA and GDPR compliant
OneDrive vs Sync.comを比較

Tresorit

Personal $11.99/mo (1 TB)

何が違うのか: Businesses handling sensitive data that need Swiss-grade encryption and EU data residency guarantees

料金比較: OneDrive: Microsoft 365 Basic $1.99/mo (100 GB) | Tresorit: Personal $11.99/mo (1 TB)

End-to-end encryptionSwiss privacy jurisdictionSecure file sharing with expiry
OneDrive vs Tresoritを比較

MEGA

20 GB free

何が違うのか: Users who want the most generous free encrypted storage without handing data to big tech companies

料金比較: OneDrive: Microsoft 365 Basic $1.99/mo (100 GB) | MEGA: Pro Lite $5.56/mo (400 GB)

End-to-end encryption by defaultGenerous free storageSecure chat and video calls
OneDrive vs MEGAを比較

iCloud

Free 5GB with any Apple ID

何が違うのか: Apple users who want effortless backup and sync without thinking about it — it just works if you are all-in on Apple

料金比較: OneDrive: Microsoft 365 Basic $1.99/mo (100 GB) | iCloud: iCloud+ 50GB $0.99/mo

Seamless sync across iPhone, iPad, and MaciCloud Drive with Finder and Files app integrationPrivate Relay for anonymous web browsing (paid)
OneDrive vs iCloudを比較

Proton Drive

Free 1GB (5GB with Proton account)

何が違うのか: Privacy-first users who already trust Proton Mail and want their files encrypted with the same zero-knowledge approach

料金比較: OneDrive: Microsoft 365 Basic $1.99/mo (100 GB) | Proton Drive: Drive Plus $3.99/mo (200GB)

End-to-end encrypted file storage and sharingZero-access encryption — even Proton cannot read your filesBuilt-in photo backup from mobile
OneDrive vs Proton Driveを比較

よくある質問

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