Does OS X Yosemite perform Safe Sleep on battery drain shut down?

I remember with Lion, and I think Mavericks, one of the best features of the MacBook Pro was an auto recovery mode, which I believe to be named "safe sleep."
After the warnings for low battery, the computer will noticeably slow (I can also see the processor speed ramp up in my iStat menu toolbar). I forget what the app is called that causes this, but I know it's the computer saving everything to the "safe sleep" mode.
After the computer has fully shut down on its own (from low battery), and after the computer is plugged back in and the power button hit, the computer restarts with a grayed out screen of my desktop as it was before shutting down with a small bar that loads. After the bar is loaded, the computer is back to its state before the shutdown.
This safe sleep mode recovers non-apple software sessions (photoshop files, autocad files) as well as apple software like safari and iTunes, as if nothing happened.
I had to explain this first because I can't find anywhere on the Apple Support Communities the name of this feature (that I believe to be called Safe Sleep), its function, or when it works and when it doesn't, etc.
So:
My question is whether or not OS X Yosemite has this automatic Safe Sleep mode?
Thanks.

It's called Hibernation, and yes, Yosemite has it.

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