diglloyd Mac Performance Guide

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Protocol for Upgrading to Mac OS X Lion

Although the vast majority of upgrades go just fine, backups need to be keep anyway, so why not protect yourself by doing it right?

  • Clone the boot volume to an external drive. Make a 2nd clone as a backup.
  • Boot the Mac from the external clone.
  • Install Lion onto the external clone.
  • Reboot, then clone back over the internal volume.

See also How to Upgrade Your System/Boot Drive.

Installing on more than one Mac

Once the installer is run, it deletes the installer app.

Download once, then before installing, copy the “Install OS X Lion.app” from your Applications folder to another drive. That copy can then be used as often as needed for your other Macs.

Reader reports

Installing Mac OS X Lion on a system with a software striped RAID boot drive is reported to destroy the boot volume, rendering it unusable. I have two (2) credible reports of this problem.

I have four other reports that installation on a software RAID boot volume has worked without difficult, so perhaps there is a risk factor that will eventually emerge.


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