Hi all, I'm relatively new to Macs and have a Macbook Pro (Retina, 15 inch, mid-2015) running OS X Yosemite. I'm looking to upgrade to macOS Sierra and it's made me realise that I should be making regular backups using Time Machine. Can anyone recommend a good, reliable but cost effective external hard drive? It's purely for backups so doesn't need to be bigger than my Macbook's 512GB. Thanks! --- Post Merged, Jul 23, 2017 --- For what it's worth, I'm currently looking at purchasing the Seagate Backup Plus Slim 1TB.