A laptop slides off the tailgate of a truck in the lot behind the shop. It lands on a corner. The screen survives. The drive inside it doesn't.
The machine is a purchase order. The folder on the desktop is not. That folder holds four years of quotes, the insurance certificates, the DOT paperwork, and the pricing sheet that took a whole winter to get right. Nobody ever moved it anywhere, because it opened when you double-clicked it, and that was enough.
The business lives in three folders
Windows has had the same three folders for a long time: Desktop, Documents, Pictures. On a small business PC, that is usually where the actual work ends up. Not because anyone decided it. Because the save dialog points there and you are in a hurry.
Those folders sit on one drive, inside one machine, in one building. If there is no copy somewhere else, there is no copy.
The space is already in the subscription
Most Microsoft 365 business plans include 1 TB of OneDrive storage per user. Microsoft's service description lists 1 TB per user for Business Basic, Business Standard, and Business Premium.
So the storage is sitting there, paid for and empty, while the quotes live on a hard drive with moving parts.
The setting that connects the two takes a few minutes per computer. Microsoft calls it folder backup. In the admin documentation it shows up as Known Folder Move. It points Desktop, Documents, Pictures, Screenshots, and Camera Roll at OneDrive. The person keeps using the same folders. The files just also exist somewhere else.
Turning it on
On the PC you want to protect, signed in with that person's own Microsoft 365 account:
1. Click the OneDrive cloud icon in the notification area. 2. Open Settings, then the Sync and backup tab. 3. Select Manage backup. 4. Turn on any folder marked Not backed up, then save your changes.
The files move into the OneDrive folder and start uploading. Microsoft's support article covers the same steps with screenshots if you want to follow along.
One warning. The folders actually move. Do it when the person is not in the middle of something, not at 4:55 on a Friday.
What it does not do
This is where people get hurt by assuming too much.
It is sync, not a separate backup. Delete a file on the PC and it is deleted in OneDrive too. It lands in the OneDrive recycle bin, where work and school accounts keep it for 93 days unless an administrator changed that setting. So the delete is recoverable, but only if someone thinks to look there.
There is a separate feature called Restore your OneDrive. That one rolls the whole account back to a point in the last 30 days. Thirty is not the same as ninety-three. Different feature, different window, and it is worth knowing both before you need either.
It does not cover Music or Videos. Only Desktop, Documents, Pictures, Screenshots, and Camera Roll.
It does not touch a network drive or a server share. If the files live on a shared drive in the back office, this setting has nothing to say about them.
It does not help when everyone shares one login. On a front desk PC where three people sign in as the same user, everything uploads into one person's OneDrive. When that person leaves, the files go with them. A shared PC needs a different answer.
And it conflicts with old folder redirection. If a server has been pushing Desktop and Documents to a network location through Group Policy, Microsoft's documentation is blunt: Known Folder Move will not work until that policy is turned off. A shop with a server in the closet should check that first.
The check you can do today
Pick one computer. The one belonging to whoever would be hurt most by losing it. Open File Explorer and see where Documents actually points. Then open OneDrive settings and look at the Backup tab.
If nothing there is turned on, you have found a gap that costs nothing to close and a great deal to leave open.
If you would rather not be the one crawling under desks to check, that is a reasonable thing to hand off.