Previously could be purchased Mac OS X 10.7 "Lion" over Apple's Mac App Store. Now the latest version of the operating system available on a physical storage medium, but with a significant price premium.
While the online version, requires the company to the appropriate USB stick called Thumb Drive. This seems to be the
same model act, which included a long time in the delivery of the MacBook Air. There is a restriction on the restoration options: the update was installed via thumb drive, can also be done to recover only in this way.
The functional recovery of the Lion App Store version is not available in this case. Meanwhile, there are also many instructions for creating a USB flash drive can be installed from which acquired online version of the operating system.