Copyright and Fair Use LR

I agree with the first question on the quiz about teachers making back up disks and if it is fair or not. I agree in most part with the answer behind the question. I believe that the teacher should be allowed to recreate disks and make copies of them if they are only for her use. If she doesn't share them with anyone then she is OK with me. I don't like the part where she has to leave the copies with the library to be put in the archives. It is her back ups and she should be able to get to them quick if she needed to. At the end of the answer they say that copies may be used if you can't get a copy of the original because it gets lost, stolen, or broken. This would take a long time and possible more money. In the mean time the teacher can't do there lesson because they have to wait for someone to come up with a copy of the disk so that she can use it! That doesn't seem fair to the teacher to me! i agree with the overall answer, but I don't agree with most of the reasons for this question. My only question is, "What harm does it do for the teacher to make a back up and only use it for her and only if it is an emergency?" I believe that teachers should be able to do this without jumping through so many hoops. This is just plain ridiculous!