Guys, for a month now, it's so annoying to update my Time Machine because my computer doesn't want to back up automatically. In the place under System Preferences-->Time Machine, where it says Next Backup: There's no time or date. It's just a couple of dashes. I can fix it by turning disconnecting my external HD, turning off TIme Machine, turning it back on, and then connect the HD again. But that's not how it's supposed to work. Anyone else having this problem?