"FCP Rescue" use question...
 

After some searches on the subject, I suppose this question is probably one any experienced FCP person would know, presumably intuitively. However, I do not. I followed several pieces of advice on the benefits of the "FCP Rescue" app, generously designed and offered by a fellow (but clearly more proficient) user. While I've not experienced many of the same "preferences horrors" that I've read about for some years, nonetheless I downloaded this as a precaution. I placed it on my desktop and thought I would use it "one day."
I subsequently read several admonitions of its use as a preventative measure and so decided to "backup" my prefs. As there is no "help" section, (I did check the somewhat limited information at the Apple download site and others I searched, including the app's author), I clicked on the "Backup" target and poof, I heard the slightly unsettling sounds of things having been tossed, without my conscious direction, into the trash. When I launched FCP, my current project was gone and my prefs were as I had left them last. Needless to say, I've not done anything else.
OK, so what did I or did I not, do here? What do I look for? What is the order?
I found a copy of my project, of course, as I have several, assiduously updated, in different locations...but I would really like to know the logical steps for the use of this seemingly very helpful and simple application. Thanks.

Hmm, I'd never even heard of this program before but took a quick look. It doesn't seem to be something that I really need, and your experience makes me even less anxious to give it a try. Generally speaking, if you don't understand what something does, and you aren't really sure why you need it, then it's best to stay away.

I have been lucky I guess and have never had to trash my preference file for FCP. Maybe someone else can shed some light on all this, but my sense is "if it ain't broke don't fix it." :-)