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#11
You get the BIOS warning about Hibernation when a change has been made that alters the System. I don't think you have any realistic option except Resume. It wouldn't offer that choice if it wasn't still conceivable.
I rely on Hibernation a lot to walk away from a PC without concern, however I'd never do it during a repair or rebuild.
There's likely someone out there who knows how to retrieve Hiberfile data and reconstruct it. But I don't know how you'd find them. This guy at least had a handle on the complexity: Reviving Windows 7 from previous hibernation