SharePoint for Small Business: Sites, Storage, Migration

SharePoint is where a small business keeps the files that belong to the company, as opposed to one person. It is included in Microsoft 365 Business Basic, Standard, and Premium. The Files tab in a Teams channel is a SharePoint library, and OneDrive is built on the same storage technology, so the three are different doors into one system. Your organization gets 1 TB of SharePoint storage plus 10 GB per licensed user, and it can replace a traditional file server for ordinary office documents.

SharePoint, OneDrive, and Teams Files: What Is the Difference?

This is the question that causes the most confusion, and the answer is simpler than the product names suggest.

	OneDrive	SharePoint site	Teams channel Files tab
What it really is	A personal SharePoint library owned by one user	A shared library owned by the organization	A folder inside a SharePoint site’s library
Who owns the files	The individual	The site’s members, through the company	The team, through its SharePoint site
Default access	Only the owner, until they share	Everyone who is a site member	Everyone in the team
Storage it uses	The user’s own 1 TB	The organization’s pooled storage	The organization’s pooled storage
When the person leaves	Files are on a deletion timer	Nothing changes	Nothing changes
Use it for	Drafts, personal working files	Department and company files	Files tied to a channel’s conversation

Microsoft’s Teams and SharePoint integration article spells out the Teams part: every team has a SharePoint site, and each standard channel’s Files tab is a folder in that site’s default document library. Private and shared channels each get their own separate site.

Two practical consequences:

1. Creating a team creates a SharePoint site, and most new SharePoint team sites can have a team added. You do not need both a “Finance” site and a “Finance” team with separate files. Pick one home.
2. The same file can be reached three ways: through Teams, through the SharePoint site in a browser, and through File Explorer or Finder once the library is synced. It is one file, not three copies.

The day-to-day rule for staff: if a file is only yours, OneDrive. If anyone else will need it, or it would matter if you left, a SharePoint library or Teams channel. Our OneDrive guide covers the personal side: sync, folder backup, and restore.

How Should a Small Office Organize Its Sites?

Think of a site as a filing room with its own door lock, and a library as a cabinet inside it. Permissions are easiest to manage at the door, so plan sites around who should have access.

A structure that suits many small offices:

• Company: policies, templates, forms, the handbook. Everyone can read, a few people can edit.
• Operations or Shared: day-to-day working files for the whole office.
• Finance: owners and bookkeeping only.
• HR: owners and whoever handles personnel files.
• Customers or Projects: one library, with a folder per customer or job, or separate sites only when outsiders need access.

Guidelines:

• Prefer a few sites with clear membership over one giant library with many folder-level exceptions.
• Keep folder depth shallow. Three or four levels is plenty.
• Name things plainly and consistently: “2026-09 Payroll Summary” rather than “final v3 USE THIS.”
• Microsoft recommends flat sites grouped with hubs instead of subsites. A small office rarely needs either.

How Do SharePoint Permissions Work?

Each site has three built-in levels:

• Owners can change settings and membership. Have two per site.
• Members can add, edit, and delete files.
• Visitors can read only.

For a site connected to a team, membership is managed in Teams: team owners become site owners, team members become site members.

Everything inside a site inherits those permissions unless someone breaks inheritance by sharing a folder or file with a different audience. That is sometimes necessary, but every exception is something a future administrator has to discover. Microsoft supports up to 50,000 unique permission scopes in a library and recommends staying under 5,000. A small office should aim for a handful.

Sharing Links

When someone clicks Share, SharePoint creates a link of one of these types:

• Anyone with the link: no sign-in required. Forwardable. Highest risk.
• People in your organization: any signed-in employee who has the link.
• People with existing access: changes nothing, just a link.
• Specific people: only the named individuals, who must verify their identity.

Microsoft notes that SharePoint’s organization-wide sharing setting starts at the most permissive option. To review it, open the SharePoint admin center, go to Policies, then Sharing. The four levels, described in Microsoft’s sharing settings article, are Anyone, New and existing guests, Existing guests, and Only people in your organization.

A reasonable baseline for a small business:

1. Set the organization level to New and existing guests unless you have a clear need for anonymous links.
2. Set the default link type to Specific people or Only people in your organization.
3. If you keep Anyone links, require them to expire and limit them to view only.
4. Set guest access to expire after a fixed number of days.
5. Tighten individual sites further. Finance and HR should be set to no external sharing.

This review matters more if you plan to use Microsoft 365 Copilot, because Copilot can surface anything a user already has access to. See what to clean up before enabling Copilot.

How Much Storage Do You Get?

Microsoft’s SharePoint limits page gives the formula for Business plans:

Total SharePoint storage = 1 TB + 10 GB for each license purchased

Licensed users	Pooled SharePoint storage
5	1 TB + 50 GB
12	1 TB + 120 GB
25	1 TB + 250 GB
50	1 TB + 500 GB

Details worth knowing:

• Each user’s 1 TB of OneDrive is separate and does not count against the pool.
• Teams channel files and channel meeting recordings do count, because they live in SharePoint.
• The recycle bin counts against the pool. Microsoft recommends emptying it regularly if space is tight.
• Version history counts too. A common library setting is 500 major versions per file, and Microsoft also offers an automatic version limit setting that trims older versions intelligently to save space.
• If you run over, Microsoft warns that the environment can be placed in read-only mode until you free space or buy more. Extra storage is sold in 1 GB increments.
• Other limits: 250 GB per file, 400 characters for the full path and file name, and a recommendation to sync no more than 300,000 files across all libraries on one computer.

To see your usage, open the SharePoint admin center and go to Sites, then Active sites. The page shows total storage used, and the list can be sorted by storage used per site.

For a typical office working in Word, Excel, and PDF, 1 TB goes a long way. Offices with large photo sets, video, scans, or drawings should measure their current server before assuming it fits.

How Do You Migrate from a File Server?

Microsoft provides free tools for this. Migration Manager, in the SharePoint admin center under Migration, installs a small agent on a Windows computer that can reach the file shares, scans them, reports problems, and copies the content. The SharePoint Migration Tool is a simpler desktop alternative for small jobs. Microsoft’s guide describes the phases as plan, assess and remediate, prepare, migrate, and onboard users.

In practice, for a small office:

1. Inventory the server. Total size, number of files, the largest folders, and when things were last opened. Material nobody has opened in a long time does not need to come along.
2. Decide what not to move. Archive or delete stale folders first. Migration is the best chance to clean up.
3. Find what cannot move. Application databases and programs that expect a drive letter do not belong in SharePoint. Common examples are desktop accounting company files, some practice management systems, and some CAD or design project files. Check each software vendor’s guidance before moving these. They may need to stay on a server, move to a cloud version, or run on a cloud PC.
4. Design the sites and permissions using the approach above. Do not copy the old server layout blindly, and do not assume old permissions were correct.
5. Run the scan and fix what it flags: paths over 400 characters, invalid characters in names, and very large files. Microsoft’s guide notes that file and folder structure and user-level permissions are migrated, while some items, such as explicit deny permissions and Windows hidden attributes, are not.
6. Create accounts and sites first, then pilot with one department for a week or two.
7. Migrate the rest in stages, then run a final pass to pick up files that changed.
8. Cut over. Set the old shares to read-only so nobody keeps working in the wrong place, and leave them available for a few weeks.
9. Connect people. On each computer, either sync the libraries someone uses daily or have them use Add shortcut to OneDrive. Pick one method per library per person. Using both on the same library causes sync errors.
10. Retire the server once nothing depends on it, and only after a backup of the final state.

Upload speed is the usual bottleneck, so do the arithmetic early. At 20 Mbps of upload, 500 GB needs roughly 55 hours of continuous transfer, which is why staged migrations run overnight and on weekends.

Before deciding, it is worth reading our broader comparison of keeping a server versus moving to the cloud and the cloud migration planning guide.

When Is SharePoint the Wrong Tool?

• Database-style applications. Anything that opens a shared data file for several users at once should follow its vendor’s hosting guidance.
• Very large working files. Video editing projects, large CAD models, and point cloud data sync slowly and can conflict. A local NAS with cloud backup, or a purpose-built service, may fit better.
• Slow or unreliable internet. Files On-Demand helps, but an office that loses its connection often will feel it.
• Backup. SharePoint has a recycle bin and version history, but those are recovery conveniences, not backup. Deleted items are kept for 93 days in total across both recycle bin stages, per Microsoft’s support article, and then permanently removed. See why Microsoft 365 needs a separate backup.

Common Mistakes

• Creating a new team or site for every topic, leaving files scattered across dozens of places.
• Recreating the old server as one enormous library with hundreds of folder-level permission exceptions.
• Keeping company files in one person’s OneDrive, where they are tied to that account.
• Leaving “Anyone” links on and never reviewing them.
• Syncing everything to every laptop instead of only what each person uses.
• Skipping the pilot, then discovering long paths and locked files on cutover day.
• Turning the server off before confirming that scanners, accounting software, and scheduled jobs no longer point at it.

Common Questions

Is SharePoint included in Microsoft 365 Business Basic?

Yes. SharePoint (Plan 1) is included in Business Basic, Standard, and Premium, along with 1 TB of OneDrive storage per user. The pooled SharePoint storage formula, 1 TB plus 10 GB per license, applies to all three.

Do we need SharePoint if we already use Teams?

You are already using it. Every team has a SharePoint site behind it and each channel’s Files tab is a folder in that site. Understanding SharePoint mainly helps you set permissions and sharing correctly, find storage usage, and restore deleted files.

Can people work on SharePoint files in File Explorer?

Yes. Click Sync on a library, or Add shortcut to OneDrive, and the OneDrive app makes the library appear in File Explorer on Windows or Finder on a Mac. With Files On-Demand, files download only when opened, so a large library does not fill the disk.

Can two people edit the same file at once?

Yes, for Word, Excel, PowerPoint, and other Office files stored in SharePoint or OneDrive. This is called co-authoring, and each person’s changes appear for the others as they type. Non-Office file types, such as PDFs and design files, do not merge, so only one person should edit those at a time.

What happens to files when an employee leaves?

Files in SharePoint sites and Teams channels stay exactly where they are. Files in the departing person’s OneDrive are different: they are retained for a limited period after the account is deleted and then removed. Move anything the company needs into SharePoint as part of offboarding.

How Coastal Growth Co. Can Help

We can inventory your file server, design a SharePoint site and permission structure that fits how your office works, run the migration in stages, and set sharing policies before anyone starts uploading. We can also identify the applications that should not move and plan for them separately. This is part of our Microsoft 365 and cloud services, and ongoing care is available through managed IT. To discuss a migration, contact us. Scope and price are agreed before any paid work.