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Over a period of time you will notice a large chunk of storage space disappear on your system Hard Drive. This is because the built in System restore is using the 15% (default setting) allocated space for storing the System Restore Points.

The Advantage of having System Restore points is so that in the case of a problem on your computer that cannot be solved by normal means, you can restore your computer back to a previous working state without affecting your own personal files.

In order for System Restore to work you must have at least 300 MB of free space. As hard drive space runs out, older restore points will be deleted as newer ones are created.


System Restore points are usually created for the following reasons:

• When you install a new application or driver.
• When you uninstall certain programs.
• When you install new updates
• By manually creating one.

Below are the typical examples of how much space is reserved by default by the System Restore

• 80GB @ 15% = 12GB
• 120GB@ 15% = 18GB
• 160GB @ 15% = 24GB
• 250GB @ 15% =37.5GB
• 320GB @ 15% = 48GB
• 400GB @ 15% = 60GB
• 500GB @ 15% = 75GB
• 750GB @ 15% = 112.5GB

As you can see from above on larger hard drives the default reserved space can be very large and way over the top.

The decision is up to you on how much space you think is required for System Restore. I personally set my System Restore maximum size allocated space to 3GB.