Hi everyone I've decided to sell my MacBook Air. I'm going to be selling it on eBay. Before I list it, though, I want to make sure I wipe the SSD of my data. Can anyone help me with how I would go about doing this? My plan is to do a full backup to my external drive, which would be the last backup of this computer, and then wipe it clean. Is there a way to do this myself? I was thinking of going to my local Apple store and asking them how to do it, but I figured someone here may have some advice. Thanks in advance.