Out of fre4e space before defrag complete

Defraggler
1

I am a new user. I downloaded then clicked the defrag last night. I expected it to run through the night. When I looked at it this morning, I saw I had less tyhan 100,000 mb of space left. The reason I chose the product was because I had only 4 g left out of 19.

How do I get the lost free space back?

2

Possibly System Restore creating backups which can easily gobble up the free space, from what I've read in the docs of another defrag tool just about any defrag program can cause it to happen.