Did you accidentally forget to save the return ?   

I went in and out of the return several times on Sunday and each time the info was there. I have auto save on.  It’s a prior client that I have prepared taxes for over 20 years. This year I entered all the data, I saved the return. Today the data from Sunday has all disappeared.  

Any chance you have a backup you can restore from ?

Was the file saved in a different drive or under different name ?       

Have you tried rebooting the computer then running homebase maintenance?

Is the data missing from the return or is the return missing in homebase? Try sorting homebase by the file name instead of client name. Sometimes the name is accidentally deleted then saved.

try typing the file name in the "start" search box...maybe you will find where it went.