Get familiar with the following steps and install Mac OS X 10.7 Lion successfully.
This will help you to recover and reinstall the operating system in case a system crashes or if there is any other event of misfortune. However, one can create a bootable Mac OS X 10.7 Lion USB flash drives and install them successfully by having some moderate knowledge about Mac. Currently the Mac OS X 10.7 Lion is only available to download for Mac App Store. You can create your own Bootable USB or DVD for Mac OS X 10.7 Lion.