Get your taxes done using TurboTax

I think what you should do is first find, open and save your good file.  Go up to File-Save.  Then make a copy of it, File - Save As and give it another name to work or test in.  Like name it TEST or something to tell apart.    You can have unlimited files.  Are you on Windows or Mac?  Mac is Duplicate.  You'll have to pay attention to which file you are working in.