Synology C2 Backup – Enterprise Cloud Backup Solution

End-to-end encrypted cloud backup for Windows and macOS with centralized management, supporting 500GB to unlimited enterprise storage with flexible retention policies.

About Synology C2 Backup

Synology C2 Backup is cloud backup service designed for personal users and small-to-medium businesses requiring affordable, compliant data protection. Built on Synology's enterprise backup infrastructure, C2 Backup emphasizes data residency control (US and Germany data centers), comprehensive encryption with user-held private keys, and hourly backup intervals enabling rapid recovery objectives. The platform integrates seamlessly with Synology NAS ecosystem while supporting standalone Windows and macOS devices. Business tier includes centralized management console, team collaboration features, and Microsoft 365 data protection. All plans feature end-to-end encryption, disaster recovery portal, and compliance certification (ISO 27001, SOC 2 Type II).

System Requirements

  • Operating System: Windows 7 SP1, 10, 11 (32-bit and 64-bit); macOS 10.15.7 (Catalina) and later including M1/M2 native support
  • Processor: Intel Pentium or AMD equivalent; modern multi-core processors (2012+) recommended for efficient deduplication
  • RAM: 2 GB (4 GB recommended for optimal performance with large backup sets)
  • Disk Space: 600 MB for application installation; backup storage depends on selected plan tier
  • Additional Requirements: Internet connection (10 Mbps+ broadband recommended); Full Disk Access permission on macOS required; administrator privileges on Windows for system backup capability

Features Of Synology C2 Backup

  • End-to-end AES-256 encryption with user-controlled private keys
  • Personal (500GB-5TB) and Business (5TB-25TB+) tier flexibility
  • Hourly backup intervals enabling rapid recovery time objectives
  • Microsoft 365 OneDrive, SharePoint, Teams protection
  • Data residency options (US or Germany data centers)
  • Forever-incremental backup reducing storage consumption
  • Centralized recovery portal for file-level and full-system restoration
  • Flexible retention policies (hourly, daily, weekly, monthly, yearly)
  • Bare-metal recovery restoring entire device state
  • Centralized admin console for business deployments (250-unlimited users)

Pros & Cons

Pros

  • Affordable personal pricing ($34.99/year 500GB significantly undercuts competitors) for cost-conscious users
  • Native Synology NAS integration leverages existing ecosystem with seamless configuration
  • Data residency control enables GDPR compliance selecting US or German data centers
  • Hourly backup intervals provide rapid recovery point objectives versus daily competitors
  • Transparent per-user business pricing ($499.95/year 5TB, 250 users) enables predictable budgeting
  • Simplified setup wizard requires minimal technical knowledge versus complex alternatives

Cons

  • Linux backup unsupported requiring Windows/macOS clients only; no dedicated Linux agent available
  • Microsoft 365 backup limited to business tier; personal tier lacks cloud data protection
  • NAS backup requires separate C2 Storage subscription (not included in backup plan)
  • No disk cloning or bare-metal imaging limiting appeal to disaster recovery scenarios
  • Maximum business tier supports 250 users; enterprises exceeding limit require negotiated enterprise pricing
  • Retainage limitations prevent version retention beyond configured policies versus unlimited alternatives

Changelog

Version 2.6.3 (September 2025):
- Improved deduplication algorithm efficiency reducing server load by 25%
- Enhanced Microsoft 365 sync stability for Teams data protection
- Added German data center availability expanding compliance options
Version 2.6.0 (June 2025):
- New M365 backup integration for SharePoint Online protection
- Improved recovery portal user interface
- Performance enhancements for hourly backup processing
Version 2.5.8 (March 2025):
- Fixed macOS Sonoma full disk access detection
- Enhanced Windows 11 system backup reliability
- Updated SSL/TLS certificate handling

Frequently Asked Questions

Is my data encrypted with C2 Backup?

Yes. All data encrypts with AES-256 encryption before transmission and storage. You control private encryption keys; Synology cannot access backup contents without your credentials. Encryption applies to all data regardless of plan tier.

What's included in the free 30-day trial?

Free trial includes full feature access on selected storage tier (500GB, 2TB, or 5TB) for 30 days. After trial expiration, backups pause until subscription activation; existing data remains protected and accessible upon subscription renewal.

Can I backup multiple computers on one personal plan?

Yes. Personal plans support unlimited device backup on single account. However, total storage shared across all devices; 500GB tier requires dividing capacity among computers versus business tier supporting team deployments.

Does C2 Backup protect my Microsoft 365 data?

Yes, for Business tier only. Personal tier lacks M365 backup. Business plans automatically protect OneDrive, SharePoint, Teams, and Outlook providing recovery options unavailable through Microsoft's native retention policies.

Where is my data stored geographically?

C2 Backup offers data center selection between United States and Germany during account setup. Selection applies to all backups; changing region requires new subscription. Geographic choice enables GDPR compliance and latency optimization.

Can I restore my data if I cancel my subscription?

Yes. After cancellation, you retain access for 60 days to download or restore all backed-up data. After 60 days, data permanently deletes. During grace period, encryption keys remain active enabling full restoration.

What's the difference between C2 Backup and C2 Storage?

C2 Backup provides scheduled device/NAS backup with versioning and retention policies. C2 Storage offers object storage (S3-compatible) for custom applications and direct file uploads. Different use cases; both integrate together for comprehensive protection.