I've seen several posts these past few days that were pretty much left hanging with regard to the conclusion of a problem. So, THAT said, let me conclude my little saga.
OK, the computer saga has come to an acceptable, no my friends, and excellent conclusion.
First of all, I was VERY smart, lucky really, to change Apple stores. The guys in my closest "go to" store are VERY condescending and I always left there FUMING. In this case, I was lucky in that I found not one, but TWO geniuses that not only sympathized with my plight, but were very knowledgeable and friendly. I went through the complete scenario and they were both confident that either or both the Time Machine and hard drives still retained the data. Worst case, a data recovery program and a few hours grabbing files.
They ran there wiz band double super secret Mac prorgrams and all of the back-ups were intact on the time machine. They showed me the dates, folders, file sizes, man, I was relieved at that.
They were 100% confident that all would be well. Those are pretty good odds, far better than my football pool. I went home, nervous, but feeling better. A LOT better. They called a couple of hours later and asked if I wanted THEM to upgrade the machine to Yosemite. I said yes. WORST case scenario, it sucks, we wipe it, reinstall Mavericks and be done with it.
Guys, this thing runs like a rocketship now. Everything is here, only a few programs don't run, only programs that there are plenty of alternatives to. I'm not a HUGE fan of the fact that it looks more and more like a phone with every new incarnation, but if it works, and if simpler graphics give me better performance somewhere else, that's fine with me.
Given the fact that I never even INTRODUCED myself, there were only friendly and helpful responses to my slightly paranoid doomsday overreaction. I belong to other forums, and I personally HATE it when someone jumps in with both feet with nothing to offer and asks for help to remedy a problem they probably caused themselves due to a lack of research.
Now, I'm going to figure out HOW to make a bootable clone. ;-)
thanks again,
ken