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Although I have other back up schemes in place for my computer (local and in the cloud), I consider my original e-book files to be an additional backup just in case I do something stupid and mess up my Calibre files (which I have already managed to do once while learning how to use it). Even backups can fail so it's wise to have more than one backup in place. Consider your originals to be yet another back up.
Of course, you can always delete the originals if you feel you no longer need them.
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