Hybrid cloud object storage gateway

When moving from a local file server to cloud object storage while keeping local sync/caching capabilities, you have two primary categories of options: native tools provided by major cloud hyperscalers (if you are tied to a specific cloud) and third-party enterprise file data platforms (if you want vendor-neutral or multi-cloud setups).

1. Native Cloud Provider Gateways

If you are already committed to a specific cloud ecosystem, the major providers offer dedicated on-premises appliances or software gateways:

• AWS Storage Gateway (S3 File Gateway): Deploys as a virtual machine (VM) or hardware appliance on-premises. It presents local NFS or SMB file shares backed seamlessly by Amazon S3, keeping a transparent local cache for low-latency reads and writes.aws.amazon.com+1
• Azure File Sync: Synchronizes your on-premises Windows Server with an Azure file share. It supports cloud tiering to turn your local server into a fast cache, keeping frequently used files local and pushing cold data to Azure.learn.microsoft.com
• Google Cloud Storage Transfer Service: While primarily used for ingestion and recurring/incremental syncing from on-premises file systems (via on-prem agents) to Cloud Storage buckets, Google also supports hybrid file-to-file syncing for data pipelines and migrations.cloud.google.com+1

2. Third-Party Enterprise File Gateways & Global File Systems

If you want multi-cloud flexibility, advanced global locking (for multi-site offices), or enterprise NAS replacement, specialized platforms sit between your local network and any major object storage (AWS S3, Azure Blob, Google Cloud Storage, Wasabi, etc.):

• Nasuni: Replaces traditional NAS and backup infrastructure with a global file system built on object storage, offering local edge appliances with infinite cloud scaling and fast caching.
• CTERA Intelligent Data Platform: Provides multi-cloud edge filers that sync local files to object storage with high-performance local caching, ransomware protection, and remote-office file sharing.
• Panzura CloudFS: A global cloud file system that turns cloud object storage into a high-performance NAS, allowing multi-site locking and instant local file access.
• NetApp Cloud Volumes ONTAP / NetApp Global File Cache: Delivers enterprise-grade file caching and storage management across hybrid-cloud architectures.gartner.com

To help narrow down the best fit, tell me:

• Which cloud provider (if any) are you planning to use (AWS, Azure, Google Cloud, or a third-party like Wasabi)?
• Do you need multi-site syncing (multiple offices accessing the same files), or just a single local server syncing up?

Several vendors offer gateways or synchronization tools that connect an existing on-premises file server to cloud storage. The best fit depends on whether you want to keep using your local file shares while syncing data to cloud object storage, or simply migrate the files and maintain a copy in the cloud.

Leading options

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1. AWS Storage Gateway — S3 File Gateway

Connects local applications and file servers to Amazon S3 using SMB or NFS, with local caching. AWS also offers DataSync for bulk migration and recurring data transfers.aws.amazon.com+2

Best for: Amazon S3 object storage.

Product details

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2. Microsoft Azure Data Box Gateway / Azure File Sync

Data Box Gateway provides a virtual gateway that uploads local files to Azure Blob or File Storage. Azure File Sync is designed for two-way synchronization between Windows Server and Azure Files, with optional cloud tiering. These serve different storage architectures.learn.microsoft.com+1

Best for: Microsoft-based file server environments.

Azure storage migration guide

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3. Alibaba Cloud Storage Gateway

Provides file gateways using SMB/NFS and block gateways using iSCSI, backed by Alibaba Cloud Object Storage Service (OSS). It can cache frequently accessed data locally while storing the larger dataset in object storage.www.alibabacloud.com

Best for: Alibaba Cloud OSS.

Official documentation

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4. Nasuni

An enterprise cloud file services platform that combines local caching and file access with cloud object storage backends. It is worth evaluating if you want a managed, distributed file system rather than just a transfer utility.www.systemsarchitect.io

Best for: Enterprise NAS replacement and multi-site file access.

Nasuni website

Which should you choose?

One important distinction: object storage is not the same as file storage. If your target is Amazon S3, Azure Blob Storage, or Google Cloud Storage, the gateway must translate file protocols into object operations. A migration tool alone may not provide a live, locally accessible file share.

Which cloud object storage are you moving to — Amazon S3, Azure Blob Storage, Google Cloud Storage, or something else? I can narrow this down to the most suitable gateway and explain its synchronization capabilities.

Bridging on-premises file storage (NFS/SMB) with cloud object storage requires a hybrid cloud storage gateway . These solutions present a local file interface to your applications while caching active data and syncing the rest to a scalable object store (like Amazon S3, Azure Blob, or Google Cloud Storage).peerspot.com

The primary options are categorized by whether they are native cloud vendor services or specialized independent enterprise platforms.

1. Native Cloud Provider Gateways

• AWS Storage Gateway (S3 File Gateway):
  • How it works: Deploys as a virtual machine (VM) or hardware appliance on-premises. It translates standard NFS or SMB protocols into S3 object requests.
  • Best for: Organizations heavily invested in AWS who need low-latency local access to frequently used data while keeping the permanent repository in Amazon S3.docs.aws.amazon.com
• Azure File Sync:
  • How it works: Transforms your on-premises Windows Server into a quick cache of an Azure File share. It synchronizes bi-directionally and retains NTFS access control lists (ACLs).
  • Best for: Windows-centric environments looking to centralize file shares in Azure while maintaining local performance via tiering.learn.microsoft.com

2. Enterprise Independent Platforms (Cross-Cloud & Multi-Cloud)

• CTERA Intelligent Data Platform:
  • How it works: Offers edge file caching appliances that connect any local NAS protocol to any hyperscale cloud object storage. It emphasizes enterprise file synchronization, ransomware protection, and multi-site locking.
  • Best for: Distributed enterprises needing secure, high-performance edge-to-cloud collaboration and centralized governance.peerspot.com
• Nasuni:
  • How it works: Replaces traditional primary NAS and backup infrastructure with a cloud-native global file system. It stores all file data and metadata directly in object storage while caching active files locally.
  • Best for: Large organizations requiring a single, infinite global namespace and fast disaster recovery without traditional backups.peerspot.com
• Panzura CloudFS:
  • How it works: Uses a patented global file system built on cloud object storage to deliver real-time file locking and consistency across multiple distributed office locations.
  • Best for: Data-intensive industries like architecture, engineering, construction (AEC), and biotech that require heavy multi-site collaboration on large files (e.g., AutoCAD, Revit).peerspot.com

Key Decision Factors

• Protocol Support: Do you strictly need SMB/NFS , or do you also require block or multi-protocol access?
• Global Collaboration: Do you have multiple offices trying to write to the same files simultaneously (requiring global file locking ), or is it a single-site cache?
• Ecosystem: Are you tied to a single cloud provider, or do you require a vendor-agnostic third-party tool?starwindsoftware.com+1

If you'd like, let me know:

• Your primary cloud provider (AWS, Azure, GCP, or multi-cloud)
• The approximate total data size and number of active users/sites
• Whether you need multi-site file locking (collaboration across offices)

I can help narrow down the ideal gateway architecture for your workflow.

Bridging on-premises file storage with cloud object storage usually involves a storage gateway, file-to-object synchronization platform, or hybrid storage appliance. The right choice depends on whether you want to preserve existing SMB/NFS file shares, migrate files into object storage, or keep data synchronized in both locations.

One important distinction: some gateways expose cloud object storage as a file system, while others actually copy and synchronize files between on-premises storage and the cloud. Those are different capabilities, so it's worth evaluating them separately.

Main gateway and synchronization options

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1. Amazon S3 File Gateway

(Best for AWS/S3)

Exposes Amazon S3 buckets as standard SMB or NFS file shares, with local caching and asynchronous uploads to S3. Good for backup repositories, application data, and cloud-backed file access.

Limitation: primarily a file interface to S3, not a general-purpose bidirectional sync engine for arbitrary file servers.

Official product page ·docs.aws.amazon.com+1

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2. Azure File Sync

Best for existing Windows file servers. Synchronizes local file shares with Azure Files, supports cloud tiering, and enables multiple server locations to share a synchronized dataset.

Limitation: the cloud endpoint is Azure Files, not Azure Blob object storage directly.

Official documentation ·learn.microsoft.com

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3. AWS DataSync

Best for scheduled or recurring transfers from existing SMB/NFS shares into object storage. Supports automated transfers, incremental updates, and multiple storage endpoints.

Limitation: transfers data between endpoints rather than providing a continuously mounted, cloud-backed file share.

Official documentation ·docs.aws.amazon.com+1

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4. NetApp Copy and Sync

Supports synchronization between SMB/NFS servers and object storage, including Amazon S3, Azure Blob, Google Cloud Storage, and IBM Cloud Object Storage.

Limitation: requires a configured data broker and appropriate cloud connectivity; synchronization behavior depends on the chosen relationship and schedule.

Official documentation ·docs.netapp.com+1

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5. Nasuni File Data Platform

An enterprise file platform that uses object storage as its foundation, with edge appliances, local caching, versioning, and file access across distributed sites.

Best when you want a managed global file system rather than simply copying files between two storage systems.

Official platform overview ·docs.nasuni.com+1

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6. Alibaba Cloud Storage Gateway

Provides SMB/NFS file access backed by Alibaba Cloud OSS, with local caching. Worth considering if OSS is your target object store.

Official documentation ·www.alibabacloud.com

Which type fits your architecture?

These are starting points rather than a complete vendor ranking. Product capabilities, cloud endpoints, and licensing should be validated against your precise requirements.

Let’s narrow it down

The most important question is: Which cloud object storage are you targeting?

1. Cloud object storage

Amazon S3

Azure Blob Storage

Google Cloud Storage

Private S3-compatible storage (e.g. MinIO, Cloudian)

Multiple clouds or object stores

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2. Existing file protocols

SMB / Windows file shares

NFS / Linux or Unix shares

Both SMB and NFS

Other / not sure

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3. Required synchronization behavior

One-way upload to the cloud

Bidirectional synchronization

Scheduled replication or migration

Cloud-backed file access with local caching

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4. Preferred deployment

On-premises virtual appliance or hardware

Cloud-managed service

Self-managed software or open source

No preference

[Compare the best-fit solutions]

The synchronization direction is especially important: a gateway that uploads files into object storage may not safely propagate cloud-side changes or deletions back to the on-premises file server. That behavior should be explicitly tested before choosing a production solution.