Cubase 12.0.60 auto backup not working

I not sure if it’s only me but cubase 12.0.60 auto backup doesn’t work I tried out different intervals but still

Hi and welcome,
Are you sure that you stopped playback in between to give the auto backup function the possibility to save? Auto save won’t save while the project is playing.
You can test that by setting the interval to one minute, make some change, stop playback and do nothing for that one minute, then check whether a backup file has been created.