I used a USB drive for the Time Machine backup but didn't like that it was sticking out and taking up the USB port. I often take out a drive and forget to put it back in. So I got this adapter and a 256GB micro SD card. This adapter fits my Late 2010 13" Macbook Air (A1369) perfectly and you won't even notice it's there. I can leave it on all the time and Time Machine backs up my data every hour. I recommend the same to everyone to do if his Macbook has an SD card slot.I used to work for Apple Care so I can tell you that if you don't back up your computer regularly when your computer won't boot up, data recovery is much more costly, difficult and time consuming . Day.
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