After pressing this button will be renamed originaldatafile to
<name of file>.bak and than will be saved last
data�from�program.�This�.bak file is for person who made some mistake and
want�return�back�their�data or for case of crash machine in time of saving
data.�If you�need�data�from .bak file, you must delete the datafile
and�then�raname�datafile.bak do�datafile (hofpoints.dat.bak to
hofpoints.dat)