I thought users here might find it interesting as well. It also explains why Win 10 defrags an SSD occasionally by implication.
https://blogs.technet.microsoft.com/ask ... le-growth/
https://blogs.technet.microsoft.com/ask ... th-part-2/
I found this useful to help explain volume shadow copies/system restore points to my sons. It's Win 7 vintage, but applies:
http://blog.szynalski.com/2009/11/volum ... m-restore/