From yesterday's backup?

ACTUALLY.. TODAY

Not really sure what you were trying to accomplish but I'm pretty sure it's not possible.   

You can do a File Save As with an open return to copy into a new file for current year to current year.

You can't transfer data from last year into a current year open file.  The program creates the current year file - not you.   

If you overwrote the current file, what you previously entered is gone....by default it shouldnt let you overwrite onto a current return, you must have taken off the safety in the options somewhere.

Thank you... I have to look for that 'safety feature' so that it does not happen again.

Luckily I printed a hard copy.