As a student, you'll be writing a handful of essays each week, so making sure you have spare copies of your documents is essential. (inspiringinterns.com)
Also have spare copies ready — better, have a resume that can be scanned. (cvtips.com)
Sometimes we watch these comfort movies so many times that we're able to quote them fluently, and in extreme cases, start carrying around spare copies in case you meet a stranger on a bus that hasn't seen PCU and you can convert them on the spot. (mutantreviewers.wordpress.com)