Restore points are stored in the hidden protected OS System Volume Information folder in the root directory of each drive you have system protection turned on. For some reason, you may need to delete a specific and all system restore points for drives in Windows 10, this guide describes 2 easy ways to do that:
Step 1: Run Disk Cleanup tool.
Press Windows logo key on the keyboard, input disk cleanup into the Search box, then hit Enter key.
Step 2: Select drives that you want to clean for. Then click OK.
Step 3: Then click Clean up system file button.
Step 4: Next, select More Options tab, then click Clean up under System Restore and Shadow Copies.
Step 5: Click Delete to confirm. That's all.
Step 1: Open System Properties.
Press Windows logo key to focus on the Search box, type in system protection, then hit Enter key.
Step 2: After the System Properties dialog opens, in System Protection tab. Under the Protection Settings section, select the Local disk, click Configure.
Step 3: Select a restore point that you want to delete, then click Delete.
Click on Continue to confirm.
Step 4: After the system restore points deleted successfully, click Close.
You will find that the Current Usage of the selected drive will now be 0 bytes. If your PC is running low on storage, you may want to adjust the maximum disk space used for system protection. As space fills up, older restore points will automatically be deleted to make room for new ones.