I'm buying an iMac and already own a MBP. Now, I purchased a 1TB G-Tech from the Apple store. This will always be connected to my iMac, but not my MBP (for obvious reasons). However, I want Time Machine to back both up. How will this happen for my MBP (clearly TM will do this automatically for the iMac)? Will I have to plug it in each night an manually tell TM to do its thing? Or is there some other way? I have read that the 1TB Apple TC is having major problems and lackluster reviews about its wireless backups. Not so sure I want to get a TC due to its hundreds of bad reviews on this function alone. Please advise asap. I'm a click away from purchasing. If I need to rethink my purchase, give me some suggestions, and why. Thanks in advance.