More than Likely I had used Drag and Drop.
I don't believe I have ever used a Copy and Paste in such Large Files.@ ~ 20-30GB per Folder.
So, to answer your question, I use Drag and Drop.
Are there Benefits or Dangers between using any of the three options you inquired?
Is it possible I could have unconsciously selected the wrong save option?
Can I correct my Dilemma?
Please keep me posted.