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How to clone and restore your system

This is a quick guide to cloning and restoring your system. I'd advise that you print this out and keep it in a safe place by your machine so that you won't waste time looking for it when your machine goes down.

Cloning your machine will create an exact copy of every single file on your computer onto a second hard drive. This can be either an internal or external disk. I'd advise external over internal because if something damages your machine, the external disk won't get damaged as well. The best time to create a clone is right after you have done a fresh Erase and Install of your operating system, have installed all of your apps and are ready to go.

Cloning
1. Download and install Carbon Copy Cloner.

2. If you are cloning to an external drive, connect it now.

3. Fire up Carbon Copy Cloner from your Applications folder. In the dialog that appears, select your system drive as the source and set your backup drive as the target.



4. Under options, make sure "Copy everything from source to target" is selected. You must check "Erase target volume" too, so as not to cause conflicts with data already on the disk. If you do not check this, the drive may not be bootable and this whole process would be pointless.



5. Click Clone and wait for it to finish. Be aware that this could take several hours.

6. Unmount your external disk (if applicable) and keep it in a safe, dry place, not too hot and not too cold. If you're paranoid like me, I'd advise connecting it to your machine every so often and verifying the disk in Disk Utility to make sure that it everything is ok.

Restoring
So the worst has happened. Your system is completely hosed and you have a deadline in 12 hours. What do you do?

Temporary Solution
1. Mount your backup disk, go to System Preferences and click on Startup Disk. If it is an external disk, it must be connected via FireWire in order to be bootable.



2. Select the backup drive in the drives list and click Restart.



3. The system will now restart in the backed-up "fresh" operating system.

This is a temporary solution to help you get your project finished without wasting time. You are advised to follow the permanent solution below.

If you have an external disk, make sure that it doesn't get disconnected either deliberately or accidentally. That's a good way to cause a kernel panic, which is never good. Don't put the machine to sleep. Shut the machine down completely before unplugging the drive. I once forgot the machine was asleep and unplugged it and my system completely froze. Not good.

Permanent Solution
1. Backup any data that you do not want to lose.
2. Boot to the backup hard disk as detailed in the Temporary Solution above.
3. In Carbon Copy Cloner, clone the backup disk over the startup disk. Follow the steps for cloning above but select your backup drive as the source and your startup disk as the target.
4. You must select "Erase the target drive".
5. Click Clone and wait for it to finish. Again, this could take several hours.
6. Go back to System Preferences > Startup Disk and set your startup disk back to the old drive and click Restart.