NieR Replicant stores its Steam PC data beneath a user-ID directory, which is useful because it keeps different Steam accounts separated but also makes casual copy/paste mistakes easier. Community troubleshooting shows that persistent completion state can survive in shared game-data files, so a single character slot is not a complete backup strategy. SaveEditor recommends copying the whole user-ID directory, keeping Steam Cloud state in mind, and restoring files from the same snapshot rather than mixing a new slot with old global data.
For this PC reference, the documented storage is Windows: %USERPROFILE%DocumentsMy GamesNieR Replicant ver.1.22474487139Steam<user-id>. The known file or folder pattern is Game and system data are stored inside the Steam-user-specific save directory; community reports commonly reference GAMEDATA among the persistent files.. The remaster stores PC progress under a Steam user ID directory in Documents. Some persistent state can remain outside the currently selected character slot, so folder-level backup is safer than removing one file.
Backup guidance: Close the game and Steam synchronization, then copy the entire user-ID directory. Keep a dated untouched copy before experimenting with GAMEDATA or individual slot files. Steam Cloud can re-download deleted or replaced files when synchronization is enabled. Launcher and cloud context matters because The save directory is Steam-account-specific. Do not merge files from different user-ID folders without keeping a known-good copy of each set.
Compatibility and recovery should stay conservative. Persistent completion/system state may be stored alongside character saves. Deleting a file to reset one behavior can have broader consequences and cloud sync may restore it. If the expected progress is not visible, If deleted data reappears, check Steam Cloud. If a save is reported corrupt after a manual replacement, restore the full matching backup set instead of mixing files from different dates. SaveEditor.com only labels a game-specific editor as available when a separate linked Tool has a verified operational runtime; this reference page by itself is not an editor claim.