I don't know how specific it is but I know it works in the Windows version of the program. In your case, I guess it's too late to do the backup for your current

I don't know how specific it is but I know it works in the Windows version of the program. In your case, I guess it's too late to do the backup for your current problem, if you miss the contacts obviously they were deleted before you knew that you can backup them. But it can help you saving the remaining ones.