Not to mention the planet could explode suddenly, so yeah, no one can be literally 100% sure that they can recover their data. > Does that mean that noone real

Not to mention the planet could explode suddenly, so yeah, no one can be literally 100% sure that they can recover their data. > Does that mean that noone really has a backup? No, it means in some abstract sense no one can be 100% sure they have a proper backup. But there are some fairly obvious ways in which you can get that number pretty close to 100%.