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m365-atlas

v1.3.0

Published

An open-source CLI backup engine for Microsoft 365 mailboxes, designed with per-tenant encryption, content-addressed storage, and efficient delta synchronization for scalable, secure backups.

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Links

Git

Maintainers

miikaokmiikaok

Keywords

m365backupemailo365s3minio

Readme

GitHub Repo Banner

CI Coverage npm License Socket Badge

An open-source CLI backup and restore engine for Microsoft 365 mailboxes. Built with per-tenant envelope encryption, content-addressed deduplication, multi-layer integrity validation, and efficient delta synchronization for scalable, secure operations against S3-compatible object storage.

Highlights

  • Per-tenant encryption — AES-256-GCM with scrypt-derived keys
  • Content-addressed deduplication — messages and attachments stored once by SHA-256 hash
  • Storage-level immutability — S3/MinIO Object Lock with time-based retention
  • Delta sync — incremental backups via Microsoft Graph delta queries
  • EML export — save emails as .eml zip archives with Outlook folder structure
  • Typed SDK — embed in Node.js apps via m365-atlas/sdk
  • Live dashboard — real-time ANSI progress for single and tenant-wide backups

Quick Start

npm install -g m365-atlas

atlas backup --mailbox [email protected]   # single mailbox
atlas backup                              # all tenant mailboxes
atlas status -m [email protected]          # check freshness
atlas restore -m [email protected] -f Inbox
atlas save -m [email protected] -o backup.zip

See Getting Started for full setup instructions.

Documentation

| Topic | Link | | --------------- | ------------------------------------------------------- | | Getting Started | docs | | Self-Hosting | docs | | Configuration | docs | | Azure AD Setup | docs | | Security Model | docs | | CLI Reference | docs | | SDK Reference | docs |

Development

pnpm install
pnpm run build          # bundle with tsdown
pnpm run test           # vitest (unit tests)
pnpm run test:coverage  # with v8 coverage
pnpm run lint           # eslint
pnpm run format         # prettier
pnpm run docs:dev       # local docs site

Contributing

See CONTRIBUTING.md for setup instructions, code conventions, architecture overview, and pull request guidelines.

License

Copyright 2026 Miika Oja-Kaukola

This project is licensed under the Apache License, Version 2.0.
See the LICENSE file for details.