OneDrive File Issues

How to Fix OneDrive Resynchronizing All Files After Reinstallation

Maira Mehtab Sep 22, 2026 868 views

Question details

The user needs to stop OneDrive from initiating a full resynchronization of all files after reinstalling the application, given that the local files and online copies already match.

Product: Microsoft OneDrive
Device & OS: not provided
Scenario: Reinstalling the OneDrive application and setting up the sync folder on a laptop.
Observed behavior: OneDrive begins synchronizing all files again from scratch, despite the online files appearing identical to the files already stored on the local hard drive.

Before you start

Log into the OneDrive web portal using your browser to visually confirm that your important local folders are fully intact online. Temporarily pause the desktop sync process while you verify your folder paths to prevent any accidental duplication or deletion of data.

Solution 1Recommended

Unlink and Relink Your OneDrive Account

Unlinking and relinking forces OneDrive to re-evaluate the local folders. By selecting your existing folder during setup, you can merge directories instead of redownloading everything.

When OneDrive is reinstalled, it may lose track of the previous synchronization state. Unlinking the PC removes the current faulty connection state. When you sign back in, choosing the exact same folder location prompts OneDrive to merge the files, which allows it to recognize that the files are already downloaded.

Open OneDrive Settings

Click the OneDrive cloud icon in your system tray (Windows) or menu bar (macOS). Click the 'Help & Settings' gear icon, then select 'Settings' or 'Preferences'.

Unlink the Device

Navigate to the 'Account' tab and click on the 'Unlink this PC' or 'Unlink this Mac' link. Confirm your choice when prompted.

Sign In and Select Folder

Enter your Microsoft account credentials to sign back into OneDrive. When prompted to choose a folder location, select the exact existing OneDrive folder on your hard drive.

Merge the Folders

A prompt will appear stating that files already exist in this folder. Click 'Use this folder' to merge the local files with your cloud directory without redownloading them.

Local Files Remain Safe: Unlinking your account will not delete any files from your computer. Your local data stays exactly where it is during this process.

Solution 2

Reset the OneDrive Application

Resetting the OneDrive app clears its internal sync cache and can resolve persistent background synchronization loops caused by a corrupted installation.

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Frequently Asked Questions

Why does OneDrive resync everything after I reinstall it?

When you reinstall OneDrive, it loses its previous internal sync cache. If you do not explicitly point the application to your existing local OneDrive folder during the new setup, it assumes it must either download all files to a new default location or verify every single existing file against the cloud version, which appears as a full resynchronization.

Will unlinking my PC delete my local files?

No. Unlinking your PC or Mac merely breaks the synchronization connection between your computer and the Microsoft cloud. All your local files will remain completely untouched in their current folders on your hard drive.

How do I ensure OneDrive merges with my old folder instead of creating duplicates?

During the setup process after relinking your account, OneDrive will ask you to confirm your folder location. Click 'Change location' and select your old OneDrive folder. A warning will appear stating 'A OneDrive folder already exists on this PC'. Simply click 'Use this folder' to merge the directories without creating duplicate files.

What should I do if resetting OneDrive doesn't resolve the sync loop?

If a reset fails, verify whether you are using a Personal or a Business account, as business policies may force specific sync behaviors. Additionally, ensure your operating system is fully updated, check that you have sufficient hard drive space, and ensure no files in the folder exceed the maximum file size limits for OneDrive.

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