Maintaining unmarked copies of PDFs?

[woosah]

I've officially got one semester under my belt, and I'm trying to do a better job of keeping my reading organized moving forward. I plan on transitioning to this "system" over winter break: http://teacherweb.ggc.edu/cte/blogs/?p=63 For those of you who do something similar, do you think it's important to maintain a clean copy of all your PDFs, without any highlights or annotations?

[IRToni]

My rule usually is: I keep an unmarked copy around if I could have trouble obtaining the unmarked pdf in the future. That means that I usually don't keep an unmarked copy around for journal articles, as I'm likely to have access to them later on relatively easy. Stuff that I downloaded off TT websites etc. is similar. Stuff that I got from professors, draft papers from conferences etc. I keep an unmarked copy around.

 

Also note, however, that it's not super difficult to delete your mark-ups from pdfs, if need be, so I wouldn't worry about it that much.