protecting data integrity of a server which is always on
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Distribution: Solaris 9 & 10, Mac OS X, Ubuntu Server
So, you're going to put in a cron job to sync, what, every 5 minutes? You're still playing a roulette game with power outage, and you're messing with your machine's speed and efficiency.
Why not just get a UPS? They aren't that expensive. If you're worried about little blips in the power, that would take care of it, and would be nicer to the server in general. If you're concerned about real outages, install the software that talks to the UPS and get whatever cable is required for that UPS. Then your server will shut down properly if there is a real power outage.
Any OS is subject to problems of power outage. Yank the power plug on a Windows box a few times, and it's likely to come up blue.