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Free, Secure, and Open-Source
Backup for Microsoft 365

The #1 open-source backup tool for Microsoft 365.

Key Features

See why Corso is a perfect fit for your Microsoft 365 backup and recovery needs.

Comprehensive Workflows

High Throughput

Fault Tolerance

End-to-End Encryption

Deduplication

Compression

Open Source

Choice of Object Storage

Retention Policies

Why Everyone Loves Corso

Community

The Corso community provides a venue for M365 admins to share and learn about the importance of data protection as well as best practices around M365 secure configuration and compliance management.

  • Community-led blogs, forums, and discussions
  • Public and feedback-driven development roadmap
  • All community contributions welcome

Data Security

Corso provides secure data backup that protects customers against accidental data loss, service provider downtime, and malicious threats including ransomware attacks.

  • End-to-end zero-trust AES-256 and TLS encryption
  • Support for air-gapped backup storage
  • Choice of backup storage provider and geo location

Robust Backups

Corso, purpose-built for M365 protection, provides easy-to-use comprehensive backup and restore workflows that reduces backup time, improve time-to-recovery, reduce admin overhead, and replace unreliable scripts or workarounds.

  • Constantly updated M365 Graph Data engine
  • Purpose-built, flexible, fine-grained data protection workflows
  • High-performance backup and recovery data movers

Cost Savings

Corso, a 100% open-source tool, provides a free alternative for cost-conscious teams. It further reduces storage costs by supporting flexible retention policies and efficiently compressing and deduplicating data before storing it in low-cost cloud object storage.

  • Free forever OSS with no licensing costs
  • Client-side compression and deduplication
  • Support for S3-compliant storage including AWS Glacier IA

Frequently Asked Questions

Start Protecting Your
Microsoft 365 Data!

Corso is Free and Open-Source

Follow our quick-start guide to start protecting your business-critical Microsoft 365 data in just a few minutes.

Get Started
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