No wonder it took so long to rerelease Final Fantasy Tactics—the source code was lost: 'Keeping that kind of data wasn't a normal thing to do at the time'

https://www.pcgamer.com/games/strategy/no-wonder-it-took-so-long-to-rerelease-final-fantasy-tactics-the-source-code-was-lost-keeping-that-kind-of-data-wasnt-a-normal-thing-to-do-at-the-time/