Although this support article is for 10.6:
The statement in the Summary appears to suggest the instructions work for 10.8 to 10.8? However the article may not help you as there are further network implications that may not apply to your situation?
Ultimately the only way you're ever going to really find out is to try it yourself. Etiher the way you think it may be work (doubtful but you never know) or the method suggested in the article or a combination of the two. Or googling for another answer elsewhere.
As ever I would try and make sure you have a full working backup of any critical data important to you before trying anything.
Or use the migration assistant. You will need to clone the server first as a clean install will wipe your data.
If you need to save network users create an OD archive first. I am not sure how to do this in ML. but in lion use the server admin app. This was a stumbling block. After the migration delete the OD directory, create a new OD master in the server app then restored the Database. Sorry, I dont have the commends at hand but a search should locate them.
I probably should retitle the post. I need to restore the server files on THE SAME computer after a clean install.
I could clone the drive, but would like to avoid that, as that would require using a big external drive I don't have handy to store the clone (500GB).
All of the documentation above is about moving from 10.6 or Lion to OSX (MLion) server. The changes under the hood in MLionServer make the articles less helpful. For example, there is no collaboration folder in MLionServer.
Could I restore just the server info from Time Machine?
LOL on the backup tip. I am Time Machined on a TCapsule and an external drive.
The irony is if I crashed I wouldn't know what files to restore. That is the essence of my question as what I am trying to do is like a rebuild of a crashed server, except I want to just restore the Server and nothing (well, little) else on the computer.
Clean install ML client
update ML client
update to server
open server app to complete the conversion
I think there are some knowledge base articles on how to copy a wiki in ML - I suggest you at least look at backing up the wiki files.