I was at the apple store ready to purchase an iMac and then was told that I could not use an external hard drive for iPhoto. I was told that iPhoto would only point to the internal hard drive. Is this true? The other thing I was told was iTunes could use an external hard drive but Time Machine would back it up but not in a way that I could access the backups. I was told that I would have to bring the back up drive in to the store to be recovered. Is this true? Just doesn't sound right but I know nothing about Macs and am looking to buy my first one. I'm very proficient with PC's. Thanks!