Earlier today I was formatting my external hdd I use for Time Machine and once I had cleared it I decided to offload some movies/series etc from my mid 2009 MBP onto my newly formatted external hdd. After having done so and deleting the relevant files form my mac (and of course emptying the trash) I checked "about this Mac" and system rofiler to see how much free space I'd cleared... To my surprise I found I had lost about 2GB and not only that but system profiler shows (After "audio", "movies", "photos" and "apps") a label saying "backups" with a file size of 50 gb! What on earth is this and how do I get rid of it?? I've attached a screenshot os you cal all see what I'm on about. MAny thanks in advance. PS my first post.