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Thanks for your answer.
Lets see:
Mutiple sites run on the same database, no I dont think I want that, becase if the main site with the db goes down, as you said every thing will be down. Besides how to keep all the uploads in sync is another headache, unless all uploada are stored in the database.
I guess cron job solution would be one. As I said, its better than have none. The cron job will not be running when the main site is down, so the copy problem will be ok. The challenge here is how fast you can switch the name server. It takes at least 2 hours to have the name server switched, some times, as the "technical" document says, 24-48 hours. If it takes that long, even 2 hours, it is useless.
If I were to shut down intentionally, I mind as well do a full backup and restore.
I am thinking in terms of desaster recovery for xoops.