I'm upgrading the HDD and OS in a 2009 Mac Mini. The old 320GB HDD has 5% unused space an is running 10.8, the new 1TB drive will have 10.9. I want to migrate all data, apps, and settings from the old HDD to the new one. I will not be migrating from one Mac to another, but to itself with a new drive. According to the Apple support site, I can migrate from a TM backup or from external disk. But which is the better option for a complete install of the old system (minus OS!)? Should I run migration assistant from a TM backup or stick the old HDD into a USB2 enclosure (which I would have to buy, hence I haven't tested)?