Lightroom backup procedure only creates a backup of the "Lightroom Catalog file" the Catalog file which is a data based file containing info about your original files, where they are located and the edits and all the work you have done with them. it has a file extension .lrcat
(LRCAT, short for Lightroom Catalog).
The Catalog file does not contain any image files or copies of them.
Backups of your Original Image files and Copies of them need to be backed up separately.
Preview files are located in the file with he same name as the Catalog file with the extension .lrdata (LRDATA, short for Lightroom data).
There is no need to backup your Preview files since once you have a copy of your catalog file and your Original Image files or a copy you can recreate the previews.
See screen capture.
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Just to emphasize what Hal has written, the Lightroom catalog does not contain your images. Hopefully, you have backed up your images somewhere. They will need to be restored to their original folder locations in order for Lightroom to use them the way they are stored in the catalog. Do you have Your images backed up? And, can they be restored to the original folder locations where they were previously?
Oh I get it, thanks. All this time I thought I was backing up my pictures, I was only backing up the LR catalog with data and changes. Fortunately, I do back up my entire drive fairly regularly and still have my originals intact in the original location. I have them backed up now, and will import from that location for my new drive...and continue to back up my drives, of course. Thanks for the explination and quick response.
I did, thanks. Now I understand.
Got it. Thanks Jim.