No, and no RTX either. NexBake bakes on the GPU when your card has Vulkan ray tracing, and on the CPU on any other computer, Macs included.
No. It bakes with its own engine.
No. NexBake bakes on your computer; your meshes never leave it.
No. You buy it once and keep it. NexBake checks it online every 20 days by itself; without internet it keeps baking until that check is due.
Yes. Export OBJ, FBX or glTF.
Yes. OpenGL or DirectX normals.
Blender 5.1 or newer on Windows 10 or 11, or on a Mac with Apple Silicon, and a free NexStudio account.