For Time Machine users, it is easy if they have a backup of their Mac pre-Lion, Lion’s Recovery HD includes an option to restore from an existing backup. And the more tech-savvy Mac users may have cloned their drives using something like Carbon Copy Cloner. In this case, also, Lion’s Recovery HD enables you to image your drive from an existing backup using Disk Utility.
If you don’t have a backup of Mac pre-Lion, the process will require:
An original Snow Leopard disk, and if you lost it, Apple still sells it for $29.
Step 1: Back up your data: HOW?
- Copy your User folder(s) (Macintosh HD/Users) to an external disk. Unless you have data scattered across the hard drive, this ought to preserve your music, photos, videos, and documents.
Step 2: Insert the Snow Leopard disk.
Step 3: boot into Recovery HD by holding down the command and “R” keys at startup [don’t try to run the installer]
Step 4: Once you’ve reached the recovery screen, Open “Disk Utility” under “Utilities” on the menu bar.
Step 5: Reformat your hard disk. In Disk Utility, open the “Erase” tab.
Step 6: Select “Mac OS Extended (Journaled)” it ought to be, by defaultâ€”and click “Erase.”, and once it’s finished, your Mac’s hard drive will be as clean as the day Steve Jobs envisioned it.
Step 7: Navigate to the “Restore” tab.
Step 8: Drag and drop “Mac OS X Install DVD” into the “Source” field, your hard drive into the “Destination” field, and click “Restore.” Quit Disk Utility and reboot your Mac when you’re finished.
Step 9: Copy over your user folder from that backup, and, as always, run Software Update for all the latest Apple patches and updates. For example, in the time that you switched to Lion, Apple released another supplemental update to Snow Leopard that ought to ease any hiccups with audio or networked printers.
Caveats for MacBook Air owners:
For diskless-Mac owners, the fact that previous directions necessitated a Snow Leopard DVD could be a bit disheartening. If you’re running the previous version of the MacBook Airs, however, don’t fret: as long as you have another computerâ€”Mac or PCâ€”with a disk drive, you can borrow that machine’s optical drive to reinstall Snow Leopard. Apple also sells an external disk drive for $79.
New MacBook Air or Mac Mini owners have no downgrade path, however. Snow Leopard lacks the necessary drivers for Apple’s latest hardware. To test, I tried to reimage our new 11-inch MacBook Air with Snow Leopard by connecting it with a Thunderbolt cable as a target disk to a drive-equipped iMac. About a third of the way through the installation process, the iMac experienced a kernel panic disabled the iMac and the MacBook Air would not boot until I restored it to Lion.
Downgrading is possible (for most): In closing, as long as you’re willing to reformat your Mac’s hard drive and start fresh, reverting to Apple OS X Snow Leopard isn’t a daunting process. It’s particularly simple if you’re diligent about backing upâ€”especially if you use Time Machineâ€”and, even if you aren’t, manually backing up and restoring is manageable if you an external hard drive.
Unlike Lion, Snow Leopard reinstallation is disk-centric. If you don’t have one, you’ll need one. For previous MacBook Air owners, this may be an extra impediment, and for the latest adopters of the Air and Mini, you and Lion are in it for the long haul. And that might not be a bad thing: Despite its youth, Lion is a mature OS from Apple and many of the growing pains users are reporting are just thatâ€”growing pains. If you can stick it out, stick with it. Otherwise, consider this your exit strategy.