I have a Macbook pro running Lion 10.7.4: If I click the apple icon (top left corner) then more info then storage and have a look at the Hard drive usage I have a Backup file of 157.55 GB. why is this. If I right click on my mackintosh HD icon on desktop and get info the it returns this: Capacity 465.49 GB......Available 140.1 GB......Used 325.3. If I add all my apps, programs, photos, movies, music then I am missing this 157.55 GB which is apparently being used for a backup. Now if I open finder , click GO, MY computer and right click to get INFO I am given this: Capacity: 465.49GB....Available 282.76GB...Used 182.73 This is about correct if I add all the total sizes of my files up. How do i get rid of this backup file so that I can use this space. I also have an external 2TB hard drive which is dedicated to TIME MACHINE and is permanently connected to my computer. Please help me with this and thank you for any answers posted..