Simplify your file server to SharePoint migration: A step-by-step walkthrough with ShareGate Migrate

Transferring years of server data to SharePoint without losing folder structure or user access is a challenge. IT admins have years of nested folders, inherited permissions, and outdated content to navigate. And during the transition, end users still need file access so they can continue working. 

ShareGate Migrate simplifies the file server to SharePoint migration process. Our trusted platform streamlines every part of the migration, from spotting permission issues to discovering existing files.

In this guide, we’ll break down how to migrate your file storage system to SharePoint Online using ShareGate Migrate. We’ll also explore how to get around the biggest pain points you’re likely to find during your file migration.

Why migrate from file servers to SharePoint Online in Microsoft 365?

Organizations migrate file servers to SharePoint Online in Microsoft 365 to modernize how files are stored, accessed, and shared.

Instead of relying on VPN access and on-premises storage, teams can securely access files from anywhere and collaborate directly in Microsoft 365 tools like SharePoint and OneDrive.

No more depending on VPN access, juggling aging hardware maintenance, or relying on data silos—just simple, scalable, and centrally managed online file storage.

Common file server migration challenges—and how ShareGate helps migrate to SharePoint

While SharePoint is a useful tool, the server migration process can be difficult and confusing. If you’re making the leap from local file server systems to SharePoint online, you may run into a few roadblocks:

• File size limitations: SharePoint supports files up to 250 GB, which means most large files won’t cause issues during migration. If a file is bigger than that, it’ll need to be split.
• Deep folder structures: Long file paths or nested folders may exceed SharePoint path limits or cause errors mid-migration.
• Complex permissions lineage: Inherited or on-premise software-specific permissions may not directly map 1:1 onto SharePoint Online.
• Redundancies: Lifting and shifting an entire file server means you’ll be carrying over any duplicate, outdated, or unused content.

ShareGate Migrate helps IT teams surface potential issues early—such as structural or permission-related conflicts—so they can address them before running a migration.

Permissions are another pain point that ShareGate smooths out. ShareGate transfers content, metadata, and permissions so collaboration environments remain usable immediately after the move. You won’t have to spend time rebuilding from scratch.

With built-in diagnostics, migration visibility, and validation reporting, you can track progress, investigate issues, and confirm outcomes—helping reduce rework and avoid post-migration surprises.

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How to migrate file server content to SharePoint Online with ShareGate Migrate

Before using a file share migration tool like ShareGate Migrate, there are a few prerequisites to address. These include reviewing permissions, mapping your file shares, and making sure the required access is configured on your destination SharePoint Online environment. 

You’ll typically need the following components in place to set yourself up for a successful file migration:

• Mapped drives or direct access to the file share
• Read NTFS permissions or higher on the source file share
• Site collection admin permissions on the destination SharePoint site
• Term store admin permissions if you plan to migrate managed metadata
• A ShareGate Migrate account with access to both the file share and the destination environment

Here’s a step-by-step guide to migrating file server content to SharePoint Online using ShareGate Migrate:

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• Click Copy in the left menu.
• Select Import external content → Import from file share.
• Connect to your destination SharePoint or Microsoft 365 environment and authenticate.
• Select the destination library.
• Browse the source file share in the left pane.
• Select the folders or files you want to migrate.
• Drag and drop items to the destination pane or click Copy.
• You can use property mappings, copy options, or Excel to modify metadata during the migration.
• Review the migration report for successes, warnings, and errors.

What to check after migrating to SharePoint Online

After migrating content to SharePoint Online, review the migration results to confirm everything transferred successfully.

Key checks include:

• Check migration reports: ShareGate generates migration reports that show successes, warnings, skipped items, and errors encountered during the migration.
• Confirm permissions, metadata, and folder structure: Confirm that important files, folders, permissions, and metadata appear correctly in the destination environment.
• Rerun migrations if needed: ShareGate migrations can be rerun to address issues or migrate remaining content without rebuilding the entire migration task.

Ready to simplify your file server to SharePoint Online migration?

File shares are messy by nature. Complex folder structures, layered permissions, years of content nobody's touched since 2019. Before you move any of it, you need to know what you're actually dealing with.

Manually cleaning this up makes a big difference but slows down your migration. 

ShareGate Migrate gives you visibility into your environment before anything moves. See what's there, map users and groups, and migrate content, metadata, and permissions to SharePoint Online using workflows built around how Microsoft 365 actually works. No guessing. No manual mapping in spreadsheets.

Content lands where it should. Structures make sense on day one. Your teams get back to work instead of filing tickets about missing files.

Once everything’s in place, ShareGate Protect keeps it that way. Clear visibility into permissions and sharing across SharePoint, Teams, and OneDrive—so you can spot risky access, fix it fast, and stay ahead of the next problem before it becomes everyone's problem.

Migration done. Governance sorted. Collaboration keeps moving.

So why not make your life easier? Talk to one of our experts for a personalized walkthrough of ShareGate Migrate!