Backing up my MacBook Air
I am not a technologically advanced kind of gal. Can someone please just tell me what kind of external storage device to buy so I can back up my MacBook Air? My computer only has two Thunderbolt ports so I need something that can plug into one of those. I really just need to be told what to buy and where to buy it. I'm not using my computer for super advanced stuff, I am just a regular person who needs to back up with Time Machine. I also have one of those USB 3.1 Type C to HDMI Adapters if that means anything...
MacBook Air 13″, OS X 10.11