Greetings! I'm trying to decide how best to work with Time Machine and external hard drives. In the past, I've always mounted external firewire drives on a need to use basis. Since I'm only using them for a manual backup, this has worked fine. However, Time Machine changes things. I prefer the external hard drive option so all my eggs are not in the same basket, so to speak. However, that begs the question of how to access external drives that require daily use. Should I always leave the externals powered on and connected, regardless of if my machine goes to sleep or shuts down? Or should I continue to manually unmount the drives, disconnect the cables and shut the externals down? Thanks!