Magazine
S3 Compatible Storage
Hybrid Cloud

Synology C2 vs S3-Compatible Storage: A 2025 Cost Analysis

01.12.2025

10

Minutes
Thomas Demoor
CTO Impossible Cloud
How choosing the right cloud backend for your NAS impacts your total cost of ownership by eliminating unpredictable fees.

When backing up a Synology NAS to the cloud, IT leaders face a critical choice: use a proprietary, integrated service or opt for a flexible, S3-compatible alternative. While the former offers simplicity, the latter provides data control and significant cost advantages. The standard S3 API has created a competitive ecosystem where transparent pricing models can reduce typical cloud storage expenses by 60-80%. This analysis breaks down the cost structures to reveal how an S3-compatible strategy with zero egress fees delivers a more predictable and lower total cost of ownership for your backup and disaster recovery needs.

Key Takeaways

  • Proprietary cloud services often include hidden egress and API fees, which can increase total storage costs by 3-5x.
  • S3-compatible storage offers flexibility and prevents vendor lock-in, allowing you to choose providers based on cost and performance.
  • A zero-egress pricing model eliminates surprise bills, enabling predictable budgeting and reducing total cloud storage costs by 60-80%.

Deconstructing Cloud Storage Bills: The Impact of Hidden Fees

Most enterprises discover their cloud storage bills are inflated by more than just capacity. Over 90% of U.S. IT leaders identify fee-related issues as a primary cause for exceeding their cloud budgets. These charges often appear as egress fees for moving your own data, costing between 5 and 20 cents per GB transferred.

Additional costs accumulate from millions of API calls, which are essential for backup applications to communicate with the storage service. Data retrieval and deletion charges add another layer of complexity, making budget forecasting nearly impossible for over 50% of businesses. This pricing model creates vendor lock-in, making it prohibitively expensive to switch providers.

Understanding these hidden variables is the first step toward building a more cost-effective backup infrastructure. A transparent economic model offers a strategic advantage, with some organizations saving up to 60% on storage. This financial instability is why 66% of U.S. firms overspend their cloud budgets, pushing them to seek more predictable solutions.

S3 Compatibility: The Key to Flexibility and Cost Control

The S3 API has become the de facto standard for object storage, enabling seamless integration with a vast ecosystem of tools, including NAS backup software. This compatibility allows you to switch your backup destination by simply changing the endpoint address, protecting your investment in existing workflows. It grants you the freedom to choose a storage provider based on performance, security, and cost-not just compatibility.

Opting for an S3-compatible provider offers several advantages for NAS users:

  • Easy Migration: It simplifies the transfer of data between providers, with zero code rewrites required.
  • Reduced Vendor Lock-in: You can work with multiple providers or switch if service levels or costs change.
  • Cost-Efficiency: A competitive market drives transparent, capacity-based pricing, eliminating surprise fees.
  • Future-Proofing: S3 is the foundation for cloud-native applications, ensuring your backup strategy aligns with modern IT.

This flexibility is fundamental to a modern data strategy, allowing you to reduce cloud storage costs without sacrificing functionality. By leveraging the S3 standard, you regain control over your data and your budget.

Performance and Security: What to Expect from Enterprise-Grade S3 Storage

True S3 compatibility goes beyond basic storage operations. An enterprise-ready alternative must deliver consistent performance and robust security features to protect critical data. An "Always-Hot" object storage model ensures all data is immediately accessible, eliminating restore delays and the hidden fees associated with tiered storage systems. This architecture can deliver up to 20% faster backup performance compared to traditional cloud storage.

For ransomware protection, immutable storage via Object Lock is non-negotiable. This feature prevents data from being altered or deleted for a specified period, creating a secure, unchangeable copy of your backups. It is a critical defense mechanism, as ransomware attacks increasingly target backup infrastructure. When choosing a provider, look for enterprise-grade compliance certifications like SOC 2 and ISO 27001 to ensure your data is handled according to strict international security standards.

This focus on security and performance provides the foundation for a resilient S3-compatible NAS backup strategy. It ensures your data is not only affordable to store but also secure and instantly available when you need it most.

Achieving Predictable Costs with a Zero-Egress Model

The most significant factor in the Synology C2 vs S3-compatible storage cost debate is the pricing model. A predictable model eliminates the variable fees that cause budget overruns. Impossible Cloud offers a clear solution: a single, predictable price for storage capacity with zero egress fees, zero API call costs, and no minimum storage durations. This approach directly addresses the primary pain points for enterprises, where egress fees can exceed storage costs by 3-5x in data-intensive workloads.

This transparent structure allows for 100% accurate expense forecasting. Organizations report 60-80% cost savings when eliminating egress fees from their backup and disaster recovery workflows. By removing these punitive charges, you are free to access and move your data as needed without financial penalty, effectively building an exit strategy into your storage plan.

This predictable-by-design approach makes it possible to calculate the lowest TCO for S3 storage. It transforms cloud storage from a volatile operational expense into a stable, manageable budget item.

For MSPs: Building Profitable BaaS with Predictable Margins

For Managed Service Providers (MSPs), cost unpredictability directly erodes profit margins. A zero-egress, S3-compatible storage backend provides the foundation for a high-margin Backup as a Service (BaaS) offering. With no surprise egress or API fees, MSPs can quote customers with confidence and maintain stable, defensible margins. This model shifts the narrative from simply reselling a vendor's product to owning a branded cloud service.

A partner-ready platform should include these key features:

  1. Whitelabel Capabilities: Offer the service under your own brand with a custom domain and UI.
  2. Multi-Tenant Console: Manage all your clients from a single dashboard with role-based access control (RBAC).
  3. Automation via API/CLI: Integrate the storage into your existing management and billing systems.
  4. Predictable Margins: Fixed costs allow you to pass savings to clients or increase profitability.

This approach empowers MSPs to build a valuable asset and achieve a significant competitive advantage. It provides the tools to deliver enterprise-grade backup solutions to regulated industries, backed by a cost-efficient and predictable architecture.

Migrating Your NAS Backups to S3-Compatible Storage

Transitioning your Synology backups to a cost-effective S3-compatible provider is a straightforward process. Because the S3 API is a universal standard, the migration requires minimal changes to your existing Hyper Backup configuration. The entire process can often be completed in under 30 minutes, immediately unlocking cost savings and greater data control.

Follow this simple checklist for a seamless migration:

  • Choose Your Provider: Select an S3-compatible provider that offers a zero-egress pricing model.
  • Create a Bucket: Log into the provider's console and create a new storage bucket in your desired region.
  • Generate Access Keys: Create a new set of S3 access keys (access key and secret key) for your backup task.
  • Update Hyper Backup: In your Synology NAS, edit your existing backup task or create a new one. Select "S3 Storage" as the destination.
  • Enter New Credentials: Input the S3 server address (endpoint), access key, and secret key from your new provider.
  • Select Your Bucket: Choose the bucket you created in step 2.
  • Run the Backup: Start the backup task to begin transferring your data to the new, cost-efficient destination.

This simple change provides an immediate exit from vendor lock-in and positions your data strategy for long-term financial predictability. It is a practical step toward optimizing your scalable cloud storage solution.

FAQ

What are egress fees and why are they important for NAS backups?

Egress fees are charges for transferring data out of a cloud provider's network. They are critical for NAS backups because restoring data-the primary purpose of a backup-is considered egress. Providers with high egress fees penalize you for recovering your own data, leading to unpredictable and often massive bills.

What does 'S3-compatible' actually mean?

S3-compatible means the storage service uses the Amazon S3 API, which has become the industry standard for object storage. This allows any application built to work with AWS S3, like Synology Hyper Backup, to work with the compatible provider without any code changes.

How does an 'Always-Hot' storage model benefit backups?

An 'Always-Hot' model means all your data is instantly accessible without any delays or extra retrieval fees. This is superior to tiered storage for backups, where data in 'cold' tiers can take hours to access and incur surprise charges, slowing down disaster recovery.

What is Object Lock and why do I need it?

Object Lock is a feature that makes data immutable, meaning it cannot be deleted or modified for a specified duration. It is a crucial defense against ransomware, which often targets and encrypts backups. With Object Lock, your backup files are secure and always available for recovery.

Can I really save 60-80% on my cloud storage costs?

Yes. For backup and archive use cases, egress fees and API call charges from traditional hyperscalers can constitute 60-80% of the total bill. By choosing an S3-compatible provider with a zero-egress, zero-API fee model, you eliminate these variable costs entirely.

Is it difficult to migrate my existing Synology backups?

No, it is very simple. In Synology Hyper Backup, you just need to edit your backup task and change the S3 provider information to the new endpoint and credentials. The S3 API standard ensures the transition is seamless with no data reformatting required.

Would you like more information?

Send us a message and our experts will get back to you shortly.