hey everyone, i have a macbook air and just bought snow leopard. while i was trying to install it (through the use of the optical drive of my mac mini), a message came up... "the disk "macintosh HD" needs to be repaired go to the computer with the mac OS X install DVD, open 'remote install mac OS X' (located in the utilities folder in the app folder) and follow the onscreen instructions for restarting your computer using the DVD when the mac OS X installer opens, follow the onscreen instructions to install mac OS X. during the installation, the installer repairs the disk automatically" ... what does this mean? i'm worried about losing files on my macbook air (and do not use time machine) so should i be backing my files up? if someone could help it would be greatly appreciated. i'm pretty stuck and am dying to try out the new OS X thanks in advance for any help given!