Mac OS X Lion retails for $29.99 in the Mac App Store, which is a very competitive price for the upgrades that it offers. With over 250 new features, Lion is turning out to be the operating system that will help test, but also begin to merge the features of iOS (Apple's iPhone and iPad operating system) with OS X (Apple's Mac computer operating system). While the digital distribution of Mac OS via App Store is nice, because it allows you to upgrade instantly at your own convenience, it has a couple of drawbacks as well. Some main points to consider are that the digital download of Lion, by default, provides no method for clean install, nor does it allow for user-friendly creation of backup discs or a backup USB flash drive, which are often times, very important to have for many reasons.
Say you want to upgrade the hard drive in your Mac computer to a SSD, a Mac OS X Lion install DVD or USB flash drive would allow you to format the new SSD and reinstall Lion. Perhaps the upgrade process from Snow Leopard to Lion did not go as smooth as you planned, again, a Mac Lion install DVD would be nice to have. There are other situations where having an install DVD or USB drive would be convenient as well...
According to their official website, Apple is going to offer a USB option for purchasing Lion in August, but it will retail for $69.00. If you have already purchased the $29.99 download of Lion, it would simply not be worth it to pay for it again, just so you can have a backup USB drive. Luckily, there are some different ways that you can go about creating a Lion backup DVD, Lion backup flash drive, and other Lion recovery options.