Backups cannot be loaded and it takes me out of the game when it is about to start

It does not allow to replace the realm by the backup copy even though several have been downloaded, it simply does the world load, but when it starts it stops and exits the application, it has been tried to replace several times by the copy but not let it do it and the same thing happens over and over, instead, if you let reset the world, but not change it by backups.