I had been talking about making a copy of it outside of Sonar, just to create an additional copy.
VERY happy you found a version of it, it definitely sucks losing stuff.
Most of us here have built up some layers of scar tissue, from losing stuff for one reason or another, and it is always "JUST before I was going to back it up".
I URGE you to create and diligently follow some sort of backup process. I don't myself happen to use the auto-save feature of Sonar, though I have not had any sort of issues with it, I just do my backups manually, and ever week, or when I am finished with any major block of work on a given project.
It is infrequent, but sometimes projects have issues - usually from some old plugin kind of thing, and Safe Mode almost always takes care of even that, but once in a while, for no particular reason, a project might have issues opening, and that's where backups come in - the are truly CRITICAL. You may never be able to get a guitar player to nail some beautiful solo, and you should never put yourself in a position to where losing something could happen. Myself and most others here have indeed been lazy and have paid DEARLY in the past for not having backed stuff up.
Bob Bone