I have been dragging my files to a external drive to have a back-up for them and I lost some of my folders. They just went completely missing. I didn't delete them, and it was all stuff that I have worked on in the past month. How do I get them back?

I have been dragging my files to a external drive to have a back-up for them and I lost some of my folders. They just went completely missing. I didn't delete them, and it was all stuff that I have worked on in the past month. How do I get them back?

You really should be doing backups with an actual backup application, especially one that will work automatically, and, if your external HD is large enough, back up your entire system.  These can automatically back up only what's changed since the  previous backup, and some will keep "archive" copies of things you've changed or deleted, also.
Too many things can go wrong, such as your internal HD failing, and you'll have a major project to reinstall everything.
You already have Time Machine, built-in to OSX.  You might want to review the Time Machine Tutorial, and perhaps browse Time Machine - Frequently Asked Questions.
#27 in the second link mentions some alternatives, too.

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