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The latter, the research files, consist of hunks of text I have copy and pasted from the web. My workflow for the research files involves going through those files and deleting as I go. In other words, when I find a quote, I might copy it into a draft file, then delete the quote. This is my way of knowing what I have already processed or not. So that by the time my research file is blank, I know I'm done. When the research file is blank, I delete it so I know I'm done.
For both these uses—writing multiple drafts, and destroying research files as I go—it strikes me that having a version control system would be helpful.