Do Time Machine backups to the Time Capsule still take place automatically when the laptop is running on battery power? Using my external USB drive, Time Machine won't backup automatically when I plug the drive in if I am not also running the laptop on AC power. If I want a TM backup when running on battery, I have to manually choose the "Backup now" option. I've read conflicting information on this. Apple's Web site states (in the "Ins and Outs of Backup" or whatever it's called) that the machine needs to be plugged in for backup to initiate automatically; however, Engadget and others imply (but don't directly say) that this isn't the case. Apple's wording, in context, might just apply to the initial (long) backup. But given TM's behavior with USB drives, I don't know. I want a Time Capsule, but if it's still required to have the laptop running on AC power in order to get fully automatic backups, then I don't think TC is worth my money when, for just a little extra effort and a little less elegance, I can setup wireless backups to an AFP share plugged into another Mac in the house. Thanks for input. Edit: I found an answer to my question on Apple's support forums. Unfortunately, the laptop does have to be plugged into a power source for backups to initiate automatically to TC. When my laptop is plugged in, it's sitting on my desk 6 inches away from my USB external hard drive. I guess I won't be getting a Time Capsule. Seems to defeat the purpose of Time Machine being a fully automatic, zero-thought backup solution, since if you want a backup while running on battery power, you still have to think about backups.