Question about Macbook Hard-driver replacement
Yes.

For only a few dollars you can buy a Sata/usb external hard drive enclosure. Remove your old hard drive and put it into the enclosure. Boot your computer up using the external drive by holding down option when starting up and selecting your drive. Then download Carbon Copy Cloner (free). Using that you can clone over all your data to the new drive which you install in your computer. If you cannot boot, like that. Re-install 10.8 to the new drive in the data enclosure, then copy over all your data using Carbon Copy Cloner. If you want to backup your sync data and iTunes library, your iDevice backups are stored in your local library folder. "~/Library/Application Support/MobileSync/Backup/" The iTunes library is stored in ~/Music/iTunes