System Protection (if turned on) is a feature that allows you to perform a System Restore, which returns your PC to an earlier point in time, called a system restore point. This is handy if your PC isn't working properly and you recently installed an app, driver, or update.
Each restore point contains the necessary information needed to restore the system to a selected state. Restore points are generated automatically when you install new applications, drivers, or Windows updates, and when you create them manually. Restoring will not affect personal files in the %UserProfile% folder, but will remove applications, drivers, and updates installed after the restore point was created.
You can adjust the maximum disk space per drive used for system protection. As the space fills, old recovery points are automatically deleted to make room for new recovery points.
This tutorial will show you how to adjust the maximum volume shadow copy storage used by a drive's system protection in Windows 10.
You must be logged on as an administrator to change the maximum size for shadow copy storage. Restore points are stored in a hidden OS volume information folder protected in the root directory of each drive that has system protection turned on.
1. Press and hold Win+X to open the quick link menu, and click "System".
2. Click "About" on the left, and then click "System Protection" on the right.
3. If prompted by UAC, click "Yes".
4. Under "Protection Settings", select the drive (for example: C:) whose maximum storage size you want to change, and then click the "Configure" button.
5. Adjust the "Maximum Usage" slider to the desired percentage, and then click "OK".
