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Software · System & repair

atlas

Open-source backup and recovery engine for Microsoft 365. Back up Outlook, OneDrive, and SharePoint to S3-compatible storage you control. Encrypted, deduplicated, incremental, and built for automation.

  • Completely free
  • Open source
  • No account

Overview

atlas is a backup program.

Features described in its GitHub repository and on its official website: incremental backups and deduplication.

Services and protocols mentioned: S3 and OneDrive.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Open-source backup and recovery engine for Microsoft 365.” — GitHub, 10 November 2026
  • “Atlas is an open-source Microsoft 365 backup engine that encrypts and deduplicates Exchange Online, OneDrive, and SharePoint backups to S3-compatible storage.” — official website, 10 November 2026

At a glance

atlas is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (Apache-2.0) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

  • Open source code
  • No account needed
  • Commercial use allowed

Sources and checks

  • Facts collected from GitHub (credit card, account, source code, publisher, licence, free status, platforms, commercial use) —
  • Last technical check: 6 November 2026
  • Description from github.com — Dépôt GitHub wisecom-oy/atlas (Apache-2.0)

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