My file went back in time

HI! i have a problem with one of my files. I´ve working in it several times, always saving, and the other day i opened and it was as almost as the begining of the work. And all my bak ups where the same…

With the file open in Rhino, go to File->Revert To->Browse All Versions… on the menu. You may be able to find a version that that you want to work with.

Thank you very much. For one moment i thought that i could solve the problem…But all the back ups are exactly the same, even in the other files.
I did the terrain with grasshopper but it was there for several days.Do any body now if this has something to do with rhino for mac being a trial??