I am no expert on the back up of the discs however, here are a couple of links that I have completed and my discs are now stored forever subject to acquiring a new computer.
With the boxed disc set, disc 1 has to be installed in your computer for X-plane to run. Purchase the USB key at the following link http://www.x-plane.com/store/desktop/x-plane_10_home-use_usb_key/
By doing so you don't have to insert/use disc 1. It can be stored with the other discs.
In the second instance watch the following video clip link from Wycliffe Barrett at https://www.youtube.com/watch?v=l9wubukUlxI The X-plane installer link mentioned in the video can be found at http://www.x-plane.com/downloads/x-plane_10_installer-updater/
If, as I have done, you follow up on these two tips, you can lock/store your discs away in a safe place basically forever.
Hope this helps.
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