Is it possible to revert changes in *already* saved file?

Hello, bad thing happened to me: I replaced all contents of file, pressed "Save" button, returned into home of pythonanywhere, and after this, I cannot use CTRL+Z to revert all changes. Is it possible to do anything to restore all previous contents of file?

(For moderators, just in case: I changed file named "". I really hope that there is a way to restore all changes.)

We generally don't provide backups in such cases, but contact and we'll see what we can do for you.