is it possible to Undo Texture Bake? accidentally baked blank texture onto almost finished texture, bake mode: textures, Blender Renderer.

doing that to get bigger margins because texture brush's bleed is either too much or not enough. usually i save work in progress, but this was an easy piece, so i skipped that step. not a big deal in losing it, but i'm still curious if it's possible to Undo a bake like it's possible to undo brush strokes or most other actions
Simple answer is No if you haven't already saved the last image to disk - a generated image texture that is being used to bake doesn't save automatically, so if you rest to bake again without saving previous results, it will not come back if you escape and undo.