SharePoint or File Server? A Decision Guide for SMEs

Starting in October 2026, Microsoft will let admins automatically move stale files on SharePoint and OneDrive into cold storage through Purview retention policies. It sounds like a minor admin toggle, but it reopens a question a lot of SMEs keep putting off: does moving the file server to SharePoint actually pay off, or does the box sitting in the server room still win on cost? The honest answer depends on company size, where people actually open files from, and how old that box is.

When a file server still makes sense

Single-location teams that hit files almost entirely from the office network, and that work with heavy CAD or video files, still get better raw performance from a local server. Opening a 4K video or an architectural drawing over gigabit LAN is smoother than pulling it over an internet connection, no matter how good that connection is. If the server is under five years old and the RAID array is healthy, there’s no budget case for retiring it early just to chase a trend.

That changes once the server is out of warranty, spare parts get hard to source, or the company starts opening a second location. Building VPN tunnels for branch file sync and running a separate backup job per site can end up costing more than a SharePoint subscription on its own.

Architecture and engineering firms show this trade-off clearly. Project folders full of 40-50 GB CAD files, a team sitting in one building, files opened and saved dozens of times a day — local network speed beats SharePoint’s cloud latency here without much debate. In practice, firms like this tend to migrate only the archive folders and keep active project work on the local server.

What actually changes with SharePoint

	File Server	SharePoint Online
Remote access	Needs VPN or RDP	Direct via browser or mobile
Version history	Usually none, relies on manual backups	Automatic, up to 500 versions per file
Permissions	Folder-level, NTFS	Library/folder-level, tied to Entra ID
Backup	Requires separate backup software	Built into Microsoft’s infrastructure
Scaling	Disk upgrade, downtime risk	Buy more storage, scales instantly
Offline access	Native, works when the network is down	Handled through the OneDrive sync client

Neither column wins outright. Offline work and raw performance on large files still favor the server; permission flexibility and multi-site access are where SharePoint pulls ahead. The decision comes down to which row actually matters more for your team.

Where the cost really moves

SharePoint storage comes bundled with Microsoft 365 Business Premium: 1 TB per tenant plus 10 GB per license. A 20-person office lands around 1.2 TB, which covers most SMEs’ file archives comfortably. Going over that limit costs roughly $0.20 per GB per month — usually far cheaper than a hardware refresh cycle.

On the file server side, cost breaks into several pieces: the server hardware itself (typically replaced every 3-5 years), the Windows Server license, supporting gear like RAID and UPS, and a separate backup product. Add to that the response time when something breaks — a server crash can take file access down entirely, while a Microsoft datacenter outage is a far rarer event. The decision shouldn’t rest on license price alone; the real difference shows up in maintenance load and downtime risk.

What the October 2026 change adds

The new auto-archive feature moves files that haven’t been opened in a set period into the Microsoft 365 Archive tier. Those files stay searchable for eDiscovery but drop out of Copilot’s index, so stale content doesn’t clutter AI search results. Setup happens on the admin side through a retention policy — no extra step for end users. The rollout starts in early October and is expected to wrap by early November 2026.

In practice, this shaves a bit more off storage costs for companies that have already moved to SharePoint: archived files stop eating into the standard quota as fast. File servers have no equivalent built-in layer — cleaning out old files is either a manual job or never happens at all.

Frequently Asked Questions

Do we have to shut the file server down completely? No. Most companies run a hybrid setup: active projects live on SharePoint, while large archives or software that expects direct local access stay on the file server a while longer.

How long does the migration take? For a 20-30 person team with a few hundred GB of files, two to four weeks including planning is a reasonable estimate. A tangled folder structure or a permission matrix that needs rebuilding can stretch that timeline.

How does offline work function on SharePoint? The OneDrive sync client downloads folders locally, so files stay accessible when the connection drops; changes sync automatically once you’re back online.

Can we carry our existing NTFS permissions over as-is? Not one-to-one. Folder-level NTFS permissions need to be rebuilt at the library and folder level in SharePoint — migration is a good moment to clean up a permission matrix that’s drifted over the years anyway.

Does the auto-archive feature cost extra? No. Retention policies are already part of Microsoft Purview in Business Premium and higher plans. The only added cost shows up if a company buys extra storage beyond the standard quota.