I once was in a situation where I had three different copies (at least) of a presentation I was going to give on at least three different media and I was really glad I did. I think the presentation finally worked on their equipment a fourth way.
Today I'm going a presentation at another school. I did most of it on my surface, and it's saved on it, on the SD Card, my Skydrive and on my Moodle Server. I'm about to put it on my harddrive moodle server. I put it on a thumbdrive when I got here and handed to the person's who I am going to use her workstation.