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#21
As you can see from that slider, I currently have 6.84 GB of restore points.
My C drive is currently 29.3 occupied.
If I deleted those restore points, I would have 29.3 minus 6.84 occupied, which is 22.46 GB.
That's with over 50 programs installed, and all Windows updates.
So, if you are getting down under 22 somewhere, you aren't far wrong.
A 30 GB drive will have about 27.9 usable when empty.