According to me, The toolbar should only contain the back button.
Devices are getting taller and taller, so the save button on the top would be a bad User Experience for the user when he uses your App one handed.
So I would go for a FloatingActionButton in Bottom|Right of the Screen
I would also suggest a FloatingActionButton which would be hidden till all the data is filled in by the user, when all the data is filled, you can fadeIn your save fab button.
You can also try those FloatingActionButtons which when clicked would provide two smaller fabs above the main Fab.
Something like this,
you can keep two fabs
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