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Ed Catmull, the co-founder of Pixar, wrote in his book Creativity Inc. that the year before the movie came out, someone entered the command ‘/bin/rm -r -f *’ on the drive where the files were saved, which immediately removes everything from the file system. Scenes started deleting, and 90% of the film was erased. Still, they panic—until they realized their backup system wasn’t working correctly.
It would have taken a year to recreate what was deleted, but luckily another employee had a second backup of the entire film on her laptop at home.
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