Another option is to use Sun's Jumpstart if a third party product is not wanted. Jumpstart is typically used for image installs of new systems but with some configuration, it can be used to restore an existing system starting from a network boot. There a few interesting write-ups on the subject available on the Web.
Lastly, there is an appliance like solution called DPQ+ Series from Data Storage Depot. This product offers a multiple OS "ghosting" feature that allows for bare metal restore of systems while interfacing with a tape library for storage. It even offers a vaulting feature for offsite storage.
I hope this helps.
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