How to create an independant backup of entire LR Classic CC including original RAW and JPEG images.

" If I make a backup disk for all the originals and a copy of the LR catalog, can the two be re-united in the event my computer is destroyed or stolen?"

As already mentioned this will work if your backup copy is on a separate drive and you keep the image files and catalog file(s) updated as files are added and edited using a file synchronization app such as Time Machine.

Make sure your backup has the exact folder structure of the originals or you won't be able to relink the backup easily.  

Yes, if you have the original photos and the Lightroom catalog file, then you can make everything work properly.  Basically, you open the Lightroom catalog and then point it to the disk location where the photos are, following these instructions: http://www.computer-darkroom.com/lr2_find_folder/find-folder.htm

You posted in the wrong forum, this is the Captivate forum. Will try to move your question to te Lightroom forum.