Is it normal for TimeMachine to take more than a week to back up to an external hard drive? I've probably have had it since sometime in 2008. I had a mid-2008 MBP when I first got my current external hard drive. That means I couldn't use my MBP for not quite ten days exactly. I started backing up on the first. Is this normal for an older external hard drive? It's a western digital portable hard drive.