Sorry no there is no external case yet to house the new PCIe versions of SSD's Apple is using in the new '13 models.
With that said you could swap out your SSD with the spare (as long as you have the same exact model). Then, using a USB drive copy off all of the stuff to the USB drive then swap back your SSD unit and copy back over the stuff you need.
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While this is a fair amount of work it should take to long to do. If you plan to get rid of the SSD I would put your MacBook air into target mode and via a second Mac wipe down the SSD before swapping yours back in.
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While this is a fair amount of work it shouldn't take to long to do. If you plan to get rid of the SSD I would put your MacBook air into target mode and via a second Mac wipe down the SSD before swapping yours back in.
Sorry no there is no external case yet to house the new PCIe versions of SSD's Apple is using in the new '13 models.
With that said you could swap out your SSD with the spare (as long as you have the same exact model). Then, using a USB drive copy off all of the stuff to the USB drive then swap back your SSD unit and copy back over the stuff you need.
While this is a fair amount of work it should take to long to do. If you plan to get rid of the SSD I would put your MacBook air into target mode and via a second Mac wipe down the SSD before swapping yours back in.