Directly from an article from inside the magic and matches up from what I can remember reading in the “The Pixar Story.” Some of the scene and asset files were still deleted and not backed up on her computer and ended up being lost.

A Pixar employee named Galyn Susman, who was the supervising technical director on Toy Story 2 had been working from home after the birth of her baby. The film’s files were automatically sent to her on a weekly basis, and she kept all of the files on her personal home computer.”

Either way as long as the employee is abiding by their NDA and are not filling their machine with viruses there is no harm in them working from home.