I rarely keep hard copies unless they are laminated or a class resource that would take a bit of producing. Purchase a hard drive from PC world (currently about £30 for 500GB or £50 for 1TB) and then file you resources. I now have three years worth of teaching resources gained from 3 different schools and a variety of websites. Also display resources, name sheets, labels etc... I probably won't use everything every year but I know where things are when I need them. Also, more importantly, don'tforget to keep a back up!