I have 3 internal drives, one for the OS, a second drive for data, a third for scratch. I have a eSATA external drive for backup and that drive gets backed up to 2 more drives that rotate on and off site, so there is ALWAYS one drive off site.
All I'm doing right now is more or less experimentation. Lr lives inside one folder which for now is just pictures taken on Thanksgiving at a family gathering, I haven't even deleted the SD card yet. I've have backed that folder up to my external.
I didn't like the way my file structure was setup so I changed that on my internal drive, and then I deleted my Lr folder on my internal just to see if I could try to recover my Lr folder from my backup, sort of a dry run. I need to have a understanding of how this all works before I commit my self to the real deal. There's no way I'm going start working with Lr "for real" until I know how to recover from a disaster, this is very important with any kind of backup.
I will go though recovering my backup at least one more time until I get it right, and I don't have ask anyone more questions about what I'm trying to do.
This was a very good learning experience, I going to try out all of the suggestions all of you have given me.
I thank all of you for your input.
I'm getting closer.