Backups - What exactly do they contain?

Background:
I have Lightroom installed on my Desktop Computer and Laptop - both Windows.
I have two Libraries - both on External Hard Drives and all my images are stored on these EHD's.
I use 'Backup' within Lightroom and save the 'Backup' to a seperate partition of the Desktop Computer, I also make a copy of this to both EHD's.
My question: What information is contained within these 'Backup Files'? For instance, should I suffer a major Desktop Computer failure and need to re-install Lightroom are all the configuration settings i.e. the ID plate etc stored within the Backup file so that by double clicking on the Backup brings everything back to where it was previously etc or does it just contain information regarding the images themselves?
Sorry if this sounds pretty basic but it's been puzzling me for days now - perhaps a case of not seeing the woods for the trees :> )

OK - thanks Lee and DW. The way I work is to upload my images from a CF card into folders (either PC or Laptop) using other software. I then backup these image folders to DVD's before going any further and finally import into Lightroom.
In view of what is being said, it might also be prudent once I have carried out any work on those images etc to back them up once more but also include the xmp and Lightrooms backup files to DVD's as well.

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