i am asking this question because i do not know what to search. 

you know there is a database that we restore back up file to it. if database deleted what we can do? for example we developed a program. and we backed up the database info's. after that all files of us such as database and software deleted(not backup file). now if we later want to restore database using backup file and we do not have database(MDF file) what we can do now?

thanks.