How To Re-Enabling System Restore

If you previously disabled system restore through the Group Policy Editor,
the option to start it again does not show in the System Properties.

You can re-enable it again by:
Run the Group Policy Editor (gpedit.msc)

Go to Computer Configuration / Administrative Templates / System / System Restore
Set Turn off System Restore and Turn off Configuration to Disable

Right click on My Computer

Select Manage

Go to Services and Applications / Services

Scroll down to System Restore Service

Set it for Automatic

Click on the Start button to start the service

Close down this window

Go back to the Group Policy Editor and configure both to Not configured

Now when you right click on My Computer, there should be a tab for System Restore and you can configure how much space will be used.