Ask five people in a small office where the latest price list is, and you may get five answers. One saved it to their OneDrive, one posted it in a Teams chat, one put it on a SharePoint site, and someone still has a copy on the desktop. Microsoft 365 gives you three places to store files, and without a plan, people use all of them.
The good news is that they are not really three separate systems. Once you understand how they fit together, the right home for each file becomes obvious.
How the three fit together
- OneDrive is each person's own work storage. Files belong to that user.
- SharePoint is shared storage that belongs to the company, organized into sites and document libraries.
- Teams is a place to work together. Files shared in a Teams channel are actually stored in a SharePoint site connected to that team. Files shared in a private chat are stored in the sender's OneDrive.
So the real decision is simple. Is this file mine, or is it the company's?
What belongs in OneDrive
OneDrive is for drafts and personal working files. Good examples:
- A proposal you are still writing before sharing it with the team.
- Personal notes, training materials and your own templates.
- Files you need to back up from your Desktop and Documents folders.
What does not belong there is anything the business needs to keep running if you are out sick or leave. When an account is removed, its OneDrive goes with it after a retention period. That is a common source of lost files, and it is one reason our employee offboarding IT checklist includes moving OneDrive files before an account is closed.
What belongs in SharePoint and Teams
Anything the company owns should live in SharePoint, whether people reach it through the SharePoint site, a Teams channel or the synced folder in File Explorer. That includes client files, contracts, accounting records, HR documents, marketing assets and standard forms.
Use Teams when a group of people actively works on files together and talks about them. Use a plain SharePoint site when files mostly need to be stored and found, such as policies, forms or archives. Both keep files under company ownership.
A simple structure for a small office
Resist the urge to copy your old server folder tree exactly. A flat structure with a few sites works better in Microsoft 365:
- Company site for things everyone needs: policies, forms, templates, the staff handbook.
- One team or site per department that has different permissions, such as Finance, HR and Operations.
- Clients or Projects as a team or site with one folder or channel per active client or job.
- Archive for closed projects and old records, with read-only access for most staff.
Keep folder depth to three or four levels. Long paths cause sync errors and make files harder to find. Use clear names with dates in a consistent format, such as 2026-11 Board Pack, rather than "final final v3."
Permissions without the mess
Permissions are where most small office setups go wrong. A few rules keep them manageable:
- Set access at the site or team level, not file by file.
- Put sensitive material, such as payroll and HR, in its own site rather than a restricted folder inside a shared one.
- Have at least two owners for every site and team, so you are never locked out.
- Limit "anyone with the link" sharing, or turn it off for sensitive sites.
- Review guest and external access every few months and remove what is no longer needed.
Migrating and keeping it tidy
If you are moving from a file server or a mix of personal folders, plan the structure first, then migrate. Clean out duplicates and old files before the move, not after. Tell staff where things now live and set a date when the old location becomes read-only.
Also remember that Microsoft 365 keeps your files available, but it is not the same as an independent backup. Deleted files, ransomware and sync mistakes can still cause loss, so consider a separate backup of SharePoint and OneDrive.
Getting help
We design SharePoint and Teams structures for small offices, migrate files from servers and personal folders, and set permissions that make sense. Learn more on our Microsoft 365 page, or see cloud backup for protecting the data once it is there. We support businesses in Los Angeles County, the Inland Empire and Ventura County.