Windows Update Backup Files

Question

Does windows update keep old versions? If so, where? My C drive is full and I don’t keep any data there, it’s all on my D drive.

Answer 1

Windows Update does keep old components and backup files for a time, and they can consume a lot of space on the C: drive even if personal data is stored on D:.

Key places and types of Windows update–related files on C:

1. Previous Windows version (Windows.old folder)
   After an upgrade (for example, to a new Windows 11 build), Windows keeps a backup of the previous version in C:\Windows.old.
   • It is kept for about 10 days, then normally deleted automatically.
   • It can be removed earlier via Settings:
     1. Press the Windows logo key, then go to Settings > System > Storage.
     2. Under the drive, select Temporary files.
     3. Check Previous version of Windows and select Remove files.
   • Warning: deleting this removes the option to roll back to the previous version.
2. Update backups, patches, and system restore data
   Even if user data is on D:, Windows itself, updates, and restore points live on C:. Over time, space is used by:
   • Windows Update patches and their backups.
   • System Restore points and Volume Shadow Copy data.
   • Registry growth and other system files.
3. Temporary and system files from updates
   Windows keeps various temporary and system files related to updates and servicing on C:. These can be cleaned up safely using built‑in tools: On Windows 11:
   • Use Storage Sense or Cleanup recommendations:
     1. Go to Start > Settings > System > Storage > Cleanup recommendations.
     2. Review categories like Temporary files and System files and select items to remove.
     3. Select Clean up for each section.
   On Windows 10 (if applicable):
   • Use Disk Cleanup and optionally compress the OS drive:
     1. In File Explorer, right‑click This PC > (C:) > Properties.
     2. On General, you can select Compress this drive to save disk space (can be reversed later).
4. Using external storage for feature updates
   If C: is too full to install a feature update, Windows can use an external drive temporarily:
   1. Go to Start > Settings > Windows Update.
   2. If shown, select Fix issues and follow the wizard to use a USB drive/SD card.

In summary: yes, Windows keeps old versions and update backups primarily under C:\Windows.old, system restore/Volume Shadow Copy, and various temporary/system files on C:. These can be cleaned up via Storage / Temporary files / Cleanup recommendations and by deleting the previous Windows version if rollback is no longer needed.

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References:

• Delete your previous version of Windows
• Free up drive space in Windows
• Free up space for Windows updates

Answer 2

Run Disk Cleanup as an Administrator.

1- Press the Start button

2- Start typing: d i s k c l etc. until the Disk Cleanup utility appears.

3- Right-click on the utility and 'Run as Administrator'.

Windows Update keeps backups of replaced files, so that you can undo an Update if you want to. Eventually your computer will delete the backups on its own, or you can do the same yourself with the Disk Cleanup utility. Remember: Once the Disk Cleanup utility is done you won't be able to undo updates.

Answer 3

Hi, I'm Bernard. I'm happy to help!

Alternatively, you can remove the upgrade files through disk cleanup:

Press the Windows key + R, then type in:

cleanmgr

Then hit OK

Follow the prompt and select "Clean up system files"

Check all Windows update-related files, then OK, and follow the prompts.

Note: This is a public forum. I may respond shortly, but I apologize in advance for any delays. I am simply a fellow user trying to provide helpful insights and information.