I have used omnidisksweeper and I found a file called "Mobilesync" which has a file called "backup". It is 14.5GB in size. Is this file my iPhone and iPad backups? Or what? Is it safe to delete? I don't have tons of files on my Air; I use dropbox and iWork to store my files and I don't really have that many pics and videos stored on my Air so i have no clue what the this 14.5GB could be. Thanks for all of your help.