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q: is it safe to delete windows defender scans history files? os: windows 10 pro (used as production server to host websites, and mail functions.)
i've noticed that de-fragmenting my hard drive (using mydefrag v4.3.1) it's taking for ever to work itself through this c:\programdata\microsoft\windows defender\scans\history\store folder. 
looking further into it i found that this folder is over 26 gb in size and is holding over 2.3 million files. the file content is encrypted - so of no use to figure out what is stored. they date range is from 2016-04 to 2019-02 (the time i stopped using defender.)
at the moment i am not using windows defender as antivirus software, but g data antivirus software. the reason i removed windows defender is because it was using 100% of the computers resources for an extended time, just making the system unusable. the server was again responsive after i switched. checking into the remouval i looked at the windows features on or off tool - and it looks like defender is not even listed. 
before running the defrag tool i did a disk cleanup system files and removed all i could (windows defender logs are not listed in the list.) i also used the remove temporary files tool offered in windows 10 (but there too, no mention of windows defender log files.)
doing some research on the subject i found this post, but very little else that sounds useful. your suggestion is much appreciated. 

a: i went ahead and deleted these files, after getting some help from here; and it worked.

a: if you don't know how to clear the protection history just check out the video
https://youtu.be/vwyoptiylak

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There are 43 "u"s.
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