For many small businesses, the last reason to keep a server in the office is the shared drive. Moving it to SharePoint and OneDrive lets people reach files from anywhere without a VPN, adds version history and better sharing controls, and removes a piece of hardware that needs backing up, patching and eventually replacing.
Done carelessly, though, a migration just recreates the same mess in the cloud. Here's how to do it properly.
1. Take inventory and clean up first
Measure how much data you have, how much of it has been touched in the last two years, and which folders are actually used. Archive or delete old data before you migrate. Every gigabyte you don't move is time saved and clutter avoided.
2. Map permissions
File servers often have years of one-off permissions. Document who needs access to what, by role or department, then simplify. SharePoint works best when permissions are set at the site or library level, not on individual folders.
3. Design the structure
Don't copy the S: drive one-to-one. A typical layout is one SharePoint site or Team per department or major function, with document libraries inside. Personal files belong in each user's OneDrive. Client or project folders can live in a dedicated site with consistent naming.
4. Check the limits
- File paths, including the site URL, are limited to 400 characters, so deeply nested folders may need flattening.
- Some characters and names aren't allowed in SharePoint and need renaming first.
- Individual files can be up to 250 GB, but very large files sync slowly.
- Syncing very large libraries to every laptop isn't recommended. Sync only what people need.
5. Choose a migration tool
Microsoft's free SharePoint Migration Tool and Migration Manager handle most small and mid-sized file server moves, preserving timestamps and mapping permissions. Third-party tools add scheduling and reporting for larger or more complex jobs. Run a pilot with one department first.
6. Cut over and support users
Do an initial bulk copy, then a final incremental sync over a weekend. Make the old share read-only so nobody keeps saving there. Set up OneDrive sync, pin the right libraries in File Explorer, and have someone on hand Monday morning.
When SharePoint isn't the right answer
Some files don't suit SharePoint: large CAD and BIM models opened by several people at once, video projects, and applications that need a mapped drive letter or a database on a share. For those, Azure Files provides a cloud file share that behaves like a traditional drive, or a small on-premise or Azure server may still be the right call.
Need help?
We plan and run file server migrations end to end, including clean-up, permissions and user support. See our cloud migration service.