Excel

Hi Rita_bas.

If you sign in to your onedrive account, you can locate the online copy of the file.  If you mouse over the file, you'll see a checkbox that you can use to select the file. 

Once the file is selected, look for the "Version history" option towards the right along the top of the screen.

You'll have the current version and a series of earlier versions to look through, one of which should have a version that contains the data that went missing.

Hope this helps.

George