How do I downgrade mountain lion back to my mac mini 2011 lion server

Hi,
Previously, my mac mini mid 2011 was installed with mac os lion server then I have purchase and upgrade to mountain lion via iTunes.
Somehow I decided to downgrade back to lion server due to use of my mac as server, unfortunately I have no idea how to downgrade with the following reasons:
1. I don't create any time machine backup before so can't use that option.
2. I have enable vault function so now the startup has hide the recovery HD icon
3. In the Recovery mode (command + R), I only see an option to download and reinstall a fresh Mountain Lion only.
4. I can't download and install Lion server from iTunes because this os was bundle with purchase of mac mini 2011 mid version.
Any comments and helps here are appreciated. Thanks.

Well, did you save a Carbon Copy Clone (http://www.bombich.com) of the Lion installation by chance? That would be the easiest to go back to and use / update. Outside of that, or having saved the original Lion installer, I know of no way to get the OS that you are after. For future referece, on a mac mini with two harddrives, I have always made a backup partition on the second drive using CCC, and schedule clone updates to that. You can't rely on TM, inmo, so something like CCC or SuperDuper is essential. Cheers,
jigs

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