If the server is used in a business environment I would go with Pargon. Acronis is more tailored to home PCs. If you use the free software and something bad happen to the image, you have no one to talk to for support.
I've been belonging to True Image fans for a long time already. californiakid, free Acronis version is a home one and doesn't suites the Server backup purpose. Only server and enterprise TI versions are designed for this..
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