How to fix Windows 11 system using too much data

Delete large files from Windows 11 and backup the files an external SSD

We need to find the root cause of the problem.

Open (Settings >> System >> Storage) & look for what app/file are consuming your storage.

Then, share a screenshot or report to investigate further.

Alternative Option: You can use TreeSize

How to fix Windows 11 system using too much data? The core of the problem is your "System & Reserved" storage, which includes your old Windows installation, the hibernation file (which reserves space equal to your RAM), and the component store. Each of these can safely be reduced.

Before you can fix the problem, you need to know what's causing it. Windows has a built-in data usage monitor that shows exactly which apps are consuming bandwidth.

If you are still looking for a way on how to fix Windows 11 system using too much data. BITS (Background Intelligent Transfer Service) is responsible for downloading Windows updates and other Microsoft content in the background. Users have reported that even after disabling BITS, it re-enables itself after a few days. However, you can throttle it to near zero.

This method requires Windows 11 Pro, Enterprise, or Education edition. If you have Windows 11 Home, this will not work.

1. Press Windows + R, type gpedit.msc, and press Enter

2. Navigate to:

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Computer Configuration > Administrative Templates > Network > Background Intelligent Transfer Service (BITS)

3. Double-click "Limit the maximum network bandwidth for BITS background transfers"

4. Select Enabled

5. In the options section, set "Limit background transfer rate (kbps)" to 0 for both:

"Scheduled time" setting

"All other times" setting

6. Click OK and close Group Policy Editor

I hope the method about how to fix Windows 11 system using too much data will be helpful to you. By setting the bandwidth limit to 0 kbps, BITS is effectively prevented from using any network bandwidth for background transfers, while the service itself remains enabled and functional.

Here we are talking about how to fix Windows 11 system using too much data. If you want a more aggressive cleanup of Windows components that may be using data in the background, there is a free, open-source PowerShell script called Win11Debloat.

What it does:

• Removes preinstalled apps
• Disables telemetry and diagnostic data collection
• Turns off Start menu ads and suggestions
• Removes Copilot button and widgets

How to fix Windows 11 system using too much data:

1. Open PowerShell or Terminal as Administrator

2. Run the following command (downloads and runs the script directly):

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& ([scriptblock]:: Create((irm "https//win11debloat. raphi. re/")))

3. Select the changes you want to apply

The script creates a System Restore point before making changes, and most changes are reversible. I recommend running this only if you are comfortable with command-line tools.

Setting a Data Usage Limit is a completely free, built-in Windows tool that can help you fix Windows 11 system using too much data. Think of it as setting a budget for your internet connection. You tell Windows, "I only have 10 GB this month," and Windows watches your usage and warns you when you get close.

How to fix Windows 11 system using too much data

Step 1: Open Data Usage Settings

• Press Windows + I to open Settings
• Click Network & Internet in the left sidebar
• Click Data usage

Step 2: Set Your Limit

• Click the Enter limit button
• Check the box for Set data limit
• Under "Limit type," choose Monthly
• Set your Monthly reset date (match this to your internet provider's billing cycle)
• Enter your data limit (for example, "15" and "GB")
• Click Save

Step 3: Enable Metered Connection

• Go back to Network & Internet
• Click on your connection type (Wi-Fi or Ethernet)
• Click on your connected network name
• Toggle Metered connection to On

Delete Temp Files Manually is a simple way to address Windows 11 system using too much data by clearing cached temporary files that can cause bloated disk usage and background overhead.

Instructions: Press Win + R, type %temp%, and press Enter. Select all files with Ctrl + A and delete them. Press Win + R again, type temp, then delete all contents in the folder. Finally, press Win + R, type prefetch, and delete all contents there.

Its advantages include requiring no extra software, being quick to perform, and automatically skipping files currently in use, making it a safe way to free up space.

Its drawbacks include only addressing cached files, not the root cause of Windows 11 system using too much data, and needing to be repeated periodically as temp files rebuild over time.

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• Be sure to close all background applications before deleting files to maximize the number of items that can be deleted.
• Do not force-delete files marked as in use; these files are required by running programs.
• Do not completely delete the Prefetch folder—simply clear its contents, as Windows will automatically rebuild the necessary files.
• This cleanup operation only frees up temporary space; it does not resolve persistent high data usage issues caused by applications or background processes.

This allows you to free 1–5GB of disk space quickly. It is suitable for routine maintenance, helping to keep your system running smoothly and reducing unnecessary background resource usage.

Delivery Optimization is one common reason Why is the system using so much data in Windows 11, as it lets your PC upload and download updates with other devices by default.

How to Fix Why is the system using so much data in Windows 11

Step 1: Open Settings → Windows Update → Advanced options → Transfer Optimization

Step 2: Turn off Allow downloads from other PCs

Step 3: Run Disk Cleanup and delete existing Transfer Optimization files

Pros

• Prevents peer-to-peer uploads that waste bandwidth
• Frees up 1–10 GB of cache files

Cons

• Disabling this feature may slow down future Windows updates

Important Notes

• This setting is particularly important if you have a metered connection.
• After disabling this setting, run Disk Cleanup to completely remove any leftover files.
• This will resolve the issue of excessive data usage in Windows 11.

This is a quick fix that effectively reduces unnecessary background data usage while freeing up valuable disk space.

If Windows 11 system uses too much data, you can remove the junk, temp and cache files to free up more space.

Windows 11 has a built-in Storage Sense feature that automatically clears temporary files, old Windows Update leftovers, and Recycle Bin contents on a schedule. You can also run it manually via Settings → System → Storage → Storage Sense, or use the classic Disk Cleanup tool (cleanmgr.exe) which lets you delete system files including old Windows installations, update caches, and error reports that can collectively take up several gigabytes.

For deeper cache clearing, flush specific caches manually. The Windows Update cache sits at C:\Windows\SoftwareDistribution\Download — stop the Windows Update service first (services.msc), delete the folder contents, then restart the service.

Similarly, the DNS cache can be flushed with ipconfig /flushdns in an elevated command prompt, the Microsoft Store cache with wsreset.exe, and the thumbnail cache via Disk Cleanup or by deleting contents of C:\Users\YourName\AppData\Local\Microsoft\Windows\Explorer.

Why is the system using so much data in Windows 11? Windows 11 has several built-in features and background processes that consume data without obvious user action. Here are the main culprits:

1. Windows Update

The biggest data consumer by far.

• Downloads updates automatically in the background
• Feature updates can be 4–6 GB each
• Cumulative monthly updates typically 500 MB – 2 GB
• Also downloads updates for other Microsoft products (Office, Defender) by default

Fix:

Settings → Windows Update → Advanced Options → Turn off "Receive updates for other Microsoft products" → Set Active Hours to limit update download timing

2. Delivery Optimization (P2P Update Sharing)

Windows 11 uses your internet connection to upload Windows updates to other PCs on the internet by default — like a torrent seeder.

Fix:

Settings → Windows Update → Advanced Options → Delivery Optimization → Allow downloads from other PCs → Off (or set to "Devices on my local network only")

3. OneDrive Sync

If OneDrive is enabled, it continuously syncs files to the cloud — photos, documents, desktop files.

Can consume gigabytes silently, especially after initial setup. In addition, video and photo folders are the worst offenders.

Fix:

System tray → OneDrive icon → Settings → Sync and backup → Manage backup → Disable folders you don't need synced