A common "burnout" point. Keep a save before the boss to ensure you don't get stuck.
Depending on how you are playing, you’ll encounter different file types. 1. Emulator Saves (.mcr, .gme, .srm) xenogears save files
Keep your memcards folder synced to Google Drive or Dropbox. 80 hours of progress is a lot to lose to a hard drive failure. A common "burnout" point