XPS 8950, System Restore - How to Configure?

I want to set up my restore points.  'Available drives' to configure are currently set as:

OS (C:) (System), ON, 2.06 GB (is this large enough...it was set automatically.

WINRETOOLS, OFF

Image, OFF

DELLSUPPORT, OFF

My drive is an SSD, 500 GB

Thanks.