Here is the situation

We tested 25 test cases under one test set and we lost 10 test cases accidently when one of our colleague was working with Execution Flow.

How do we get back 10 test cases?

TD Admn have backup copy(which he takes every day) and he said he can put complete project up, but not individual test sets or test cases?

Project has got almost 50 test sets and I do not want all of them?

Did any body come across this kind of situation.

We can create the test cases(each has got almost 70 steps), but is there any way to get back.