Reduce Disk Space Used by System Restore in Windows 10
Use the keyboard shortcut Windows Key+R to launch the Run dialog and type: sysdm.cpl and hit Enter.
With the System Properties window opens, select the System Protection tab. Under Protection Settings, select your local drive and then click the Configure button.
Under the Disk Space Usage section, slide the Max Usage slider to the percentage of space you want to use.
Keep in mind that when you lower the amount of space, older restore points will be deleted.
Of course, if you want to disable system restore and not use any space, select to disable system protection. Again, it’s turned off by default.