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A weekly ghost image would be like a lower quality Raid setup.
I can think of 2 ways Pete:
Order 2 new identical computers and 1 raid controller card.
Take the hard drive out of computer 2
Install the raid controller card in computer 1
Install the second drive as a raid clone of the primary drive
If something happens, pop the one of the drives out of the broken machine, put it in the secondary computer and there you go.
But really, if he's looking to protect against database failures, it would be best to use an external (offsite is even better) drive as a backup and schedule database dumps.
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