How Much Space Do System Restore Points Use? Setting the Limit
The Feature That Quietly Reserves a Tenth of Your Disk
Short answer: system restore points are stored as Volume Shadow Copies, and Windows reserves a percentage of the drive for them. You can see how much is actually used by running `vssadmin list shadowstorage` in an elevated command prompt, and change the reserved limit with the slider under System Properties > System Protection > Configure. On a small SSD, dropping that setting from 10% to 3-5% can reclaim 20-50 GB without turning protection off; it simply keeps fewer restore points. The Delete button in the same window clears every existing point — that frees space immediately but also removes your ability to roll back to any earlier state.
This space never appears in Explorer: no folder-size tool counts shadow copies. That makes it one of the most overlooked causes of "there is a 40 GB hole on my disk and I cannot find what is using it".
Key Takeaways
- Restore points are stored as shadow copies and are invisible in Explorer; folder-size tools do not count them.
- `vssadmin list shadowstorage` shows real usage: used, allocated and maximum space are listed separately.
- The limit is set with the slider under System Properties > System Protection > Configure; 3-5% is a reasonable target on a small SSD.
- Lowering the limit does not disable protection; it just keeps fewer restore points, deleting the oldest automatically.
- The Delete button in the same window clears all points instantly but removes your ability to roll back to anything earlier.
- Turning System Protection off entirely frees the most space but leaves no point to return to when a driver breaks the system.
Shadow copy space: options and consequences
| Action | Space reclaimed | Effect on protection | When it is right |
|---|---|---|---|
| Lower the limit from 10% to 5% | Moderate — usually 10-30 GB | Fewer points kept, protection continues | The best balance for most people |
| Lower the limit to 3% | High | Usually only 1-2 points survive | SSDs of 256 GB and below |
| Delete existing points | Immediate and large | Rollback history reset to zero | When the system is healthy and space is urgent |
| Turn System Protection off | The most | No restore points created at all | People taking regular image backups |
| Do nothing | None | Full protection | People with a roomy drive |
Where Are Restore Points Stored?
When Windows creates a restore point it does not copy files into an ordinary folder. Instead it uses the Volume Shadow Copy service to take a snapshot of the drive's current state and then records subsequent changes at block level. That data lives under the `System Volume Information` folder, which is both hidden and not openable by normal means even as an administrator.
The consequence is that no folder-size tool can report this space correctly. Right-click the drive in Explorer and choose Properties and it counts within "used space", but no folder appears to account for it. In disk analysis tools it usually surfaces as an unexplained discrepancy.
How much is used depends on the Windows version and the setting. The default limit is typically between 3% and 10% of drive capacity; on a 512 GB SSD that is 15-50 GB. Because system updates, driver installations and program setups all create automatic points, that space fills over time.
How Do You Measure What Is Being Used?
The only reliable route is the `vssadmin` tool. In an elevated command prompt, type `vssadmin list shadowstorage`. The output gives three values: used shadow copy storage space, allocated space and maximum space. The first is what is genuinely occupied right now; the third is the most Windows is allowed to take.
`vssadmin list shadows` lists every existing snapshot with its creation date. It is common to see far more entries than expected; every Windows update, every driver installation and some program setups create their own point.
These two commands also settle whether restore points are the cause at all. If used space comes back as a few hundred megabytes, something else is filling your disk and there is no point fiddling with this setting.
Lower the Limit, or Delete the Points?
These are different actions, and in most cases the first is the right one. When you lower the limit, Windows automatically deletes the oldest points above the new ceiling while protection keeps working and new points continue to be created. That is how you reclaim most of the space while keeping the safety net.
You find the setting under `sysdm.cpl` > System Protection > Configure. The "Max Usage" slider works in percent. On SSDs of 256 GB and below, 3-5% is a reasonable target; that usually leaves room for one or two points, which covers most scenarios. On drives of 1 TB and above there is no need to change the default.
The Delete button in the same window removes every existing point at once and gives the biggest immediate gain. But the cost is clear: no point remains that you could roll back to. Only do this while the system is behaving, and take a fresh point with the Create button immediately afterwards.
Should You Turn System Protection Off Entirely?
Turning it off frees the most space and is a defensible choice in some situations: if you take regular full system images, or you reinstall the machine from scratch often anyway, restore points add little for you.
For most people, though, it is a bad trade. The moment restore points genuinely earn their keep is when a broken driver update or a bad program installation leaves the system unbootable. Being able to roll back a few days with one click is the difference between that and reinstalling the machine. Turn protection off and that option disappears entirely.
The balanced approach is to leave protection on, set the limit according to the size of your drive, and solve the real space problem elsewhere. The same machine usually also carries tens of gigabytes in `C:\Windows\Installer`, the `WinSxS` component store, old user profiles and the search index. Disk Mop's Disk Analysis and Disk Treemap modules sort those items by size including hidden folders, showing which one is genuinely worth your time.
Frequently Asked Questions
If I delete restore points, do I lose my files?
No. Restore points cover system files, the registry and program installations; they do not touch personal files such as Documents or Pictures. Deleting points only removes the ability to roll back — your current files are unaffected.
Does Disk Cleanup clear this space?
Partly. Under Disk Cleanup > Clean up system files > More Options there is a "System Restore and Shadow Copies" section that deletes all but the most recent point. It does not change the reserved limit, so the space fills up again over time.
Why do my restore points disappear on their own?
When the allocated space fills up, Windows automatically deletes the oldest points. If the limit is low, only one or two points may be kept. Certain disk cleanup operations and drive changes can also invalidate points.
Can I set the limit to zero?
Dragging the slider to zero effectively disables System Protection and Windows warns you about it. If you do want protection off, the explicit "Disable system protection" option in the same window is the clearer choice.
Verdict
System restore points are the most overlooked disk consumer precisely because they never appear in Explorer. The right move is not to wipe them but to measure real usage with `vssadmin list shadowstorage` and set the limit according to your drive size — 5% on a small SSD, the default on a roomy one.
To see the other items hiding in the same way on the same machine, Disk Mop's Disk Analysis module sorts the drive by size including system folders, and the Disk Treemap view makes the same data readable at a glance.
Find where the invisible space on your disk went
One-time payment for lifetime access to all features. No subscription, no hidden fees.
Download Disk Mop Now