Can I change back from Mountain Lion 10.8 to Snow Leopard 10.6?

I have iMac 10.6 (Snow Leopard). If I were to upgrade to 10.7, 10.8 or 10.9 and decided that I would rather go back to my current 10.6 Snow Leopard version, is that possible to do? And are there any problems related to reverting back to that earlier version?
-- Dennis

1. Yes. Install 10.6 or restore a backup of it onto a blank drive or partition, erasing the one containing the newer OS if needed.
2. If you use an install DVD, restart the computer with the C key held down to start the process.
(103477)

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