While it is one of the most frustrating experiences in gaming, In many cases, these save files can be recovered, or at least mitigated, especially on PC.

Depending on your gaming platform, you can use several proven methods to recover your progress or prevent future data loss. Solutions for PC (Steam)

Move your corrupted main save file ( slot0.save ) to a temporary folder on your desktop to safe-keep it.

If this happens across multiple games, your PC SSD or console hard drive might be failing. Run a diagnostic check.