SharePoint vs OneDrive vs Teams: Where Should Files Live?

Q: What is the difference between SharePoint, OneDrive, and Teams?

OneDrive is personal storage tied to one user account. SharePoint is organizational storage organized into sites and document libraries with their own permissions. Teams is a chat and meeting app that stores its files in a SharePoint site created automatically for each Team. The practical decision is OneDrive versus SharePoint; Teams is one way of getting into SharePoint with chat attached.

Q: Should company files be stored in OneDrive or SharePoint?

Company and departmental files belong in SharePoint, where they survive staff turnover and can be governed with group-based permissions. OneDrive should hold only personal drafts and in-progress work. A simple test: if losing the file when an employee leaves would cause a problem, it should not be in OneDrive. Move documents to SharePoint when they become company records.

Q: When should I create a Team instead of a SharePoint site?

Create a Team when a group needs chat, meetings, and shared files together for a defined purpose such as a project, committee, or department that collaborates constantly. Create a SharePoint site directly for records, reference material, and department archives that do not need a chat space. Have an administrator create Teams on request with a naming convention so sites do not multiply.

OneDrive is for files that belong to one person, SharePoint is for files that belong to the company or a department, and Teams is a workspace that stores its files in SharePoint behind the scenes. The simple rule: if you would be in trouble losing it when an employee leaves, it does not belong in OneDrive. Most of the file chaos we untangle in Treasure Coast offices comes from ignoring that one rule and from creating Teams without deciding what they are for.

SharePoint vs OneDrive vs Teams: how do they relate?

Think of Microsoft 365 as one storage system with three front doors.

OneDrive is a personal library tied to a user account. Only that person sees it unless they share specific files. When the account is deleted, the library is deleted after a retention period.
SharePoint is a collection of sites, each with one or more document libraries. Sites belong to the organization, have their own permissions, and survive staff turnover.
Teams is the chat and meeting application. Every Team you create automatically creates a SharePoint site, and every channel becomes a folder in that site's library. The Files tab in a channel is simply a view of SharePoint.

So there is no real competition between SharePoint and Teams; Teams is a convenient way to get to SharePoint with chat attached. The genuine decision is OneDrive versus SharePoint, and whether a given SharePoint site should be created through Teams or directly.

Where should each kind of file live?

Personal working files: OneDrive

Drafts, notes, personal templates, and anything in progress that nobody else needs yet. OneDrive is also where Desktop and Documents folders should sync so a dead laptop does not mean lost work. When a draft becomes a company document, move it to SharePoint. The habit to teach: OneDrive is a desk drawer, not a filing cabinet.

Departmental and company records: SharePoint sites

Client files, HR records, finance, policies, contracts, project archives, and anything with a retention requirement. Create one site per department or function, with permissions set at the site or library level. For a medical practice that might be Administration, Clinical Operations, Billing, and HR; for a construction firm, Estimating, Projects, Accounting, and Safety.

Active collaboration and projects: Teams

A Team is right when a group needs to chat, meet, and work on files together for a defined purpose: a project, a committee, a department that lives in chat all day. Files uploaded in the channel land in the Team's SharePoint site, which is fine as long as the Team was created deliberately.

What are the common sprawl mistakes?

We see the same handful in nearly every tenant that grew without a plan.

Company files in one person's OneDrive. The office manager's OneDrive becomes the de facto server, shared link by link. When they leave or go on vacation, access breaks.
A Team for everything. Someone creates a Team for a lunch order and it becomes a permanent SharePoint site with orphaned files. Fifty Teams later, nobody knows where anything is.
Private channels and chats as file storage. Files shared in a private chat are stored in the sender's OneDrive, not in a Team. Move important attachments to the proper library.
Deep folder trees. Ten levels of nested folders recreate the old file server's problems. Keep folders shallow and use metadata or search instead.
Link sharing set to anyone. The default share option in many tenants creates links that work for anyone who has them, forever. Change the default to people in your organization and review external sharing.
Everyone is an owner. Owners can delete the whole site. Two or three owners per site is plenty.

A starter structure that holds up

For a business of 10 to 100 people, this layout works well and stays manageable.

A Company hub site with policies, forms, templates, and the staff directory. Everyone has read access; a few people can edit.
One site per department as listed above. Department staff can edit; managers own; other departments get read access only where it makes sense.
A Clients or Projects site with one folder or library per client or job, named consistently, such as year-client-project. This is often the busiest site and benefits from a simple naming standard more than any other.
Teams only for groups that truly collaborate, created by an administrator on request, with a naming convention and an owner responsible for cleanup.
Archive libraries for closed projects and past years so active libraries stay fast and searchable.

Set permissions with Microsoft 365 groups rather than individual names so onboarding and offboarding is a matter of group membership. Turn on retention policies appropriate to your industry, and make sure the whole tenant is covered by third-party Microsoft 365 backup, because SharePoint's recycle bin is not a backup.

Is it OK to sync SharePoint libraries to File Explorer?

Yes, and it is how most staff prefer to work, but with limits. Syncing a handful of libraries is fine; syncing the entire tenant to a laptop makes the sync client unreliable and fills the drive. Encourage staff to use the Add shortcut to OneDrive option for the libraries they use daily and to open everything else in the browser or Teams. On shared or older computers, skip sync entirely.

How to migrate an old file server into this structure

Do not lift and shift the whole server into one library. Take the inventory, decide which folders map to which site, archive what has not been opened in years, and move department by department with the staff who own the data. A few weeks of planning prevents years of confusion. This is a standard part of our Microsoft 365 migration projects, and it is where most of the value of the move is realized.

If your files are scattered across OneDrives, a dozen Teams, and an old server, MainSail Data can design a structure that fits how your office actually works and move everything into it. We offer a free Microsoft 365 review for businesses across the Treasure Coast. Call (772) 794-1194 or reach out online.

SharePoint vs OneDrive vs Teams: Where Should Files Live? Microsoft 365 · 5 min read