Dark Souls III is a profile-container game: DS30000.sl2 can hold multiple characters, so copying it is not the same as exporting one slot. Manual backups remain especially important because players should not treat launcher sync as a guaranteed recovery system. Archive the full account-ID directory at important milestones. If you later experiment with a character manager or editor, keep the untouched original separate from every generated copy.
For this PC reference, the documented storage is Windows: %APPDATA%DarkSoulsIII<user-id> | Linux / Steam Play: Steam Play: <SteamLibrary-folder>/steamapps/compatdata/374320/pfx/. The known file or folder pattern is DS30000.sl2. The standard PC profile uses one DS30000.sl2 container under the account-ID folder. Multiple characters are stored inside that container rather than as separate files.
Backup guidance: Copy DS30000.sl2, preferably by archiving the full account-ID folder, before major progression, mods, or migration. Do not rely on Steam Cloud as the only backup for Dark Souls III; current community reports continue to emphasize local manual backups. Launcher and cloud context matters because The account-ID directory is part of the profile. The save location is separate from the game installation directory.
Compatibility and recovery should stay conservative. Replacing DS30000.sl2 replaces the profile container containing multiple character slots. Character-level import/export is a separate game-specific operation. If the expected progress is not visible, If a migrated file is ignored, restore the original and confirm the account folder and game version before attempting identity edits or third-party conversions. 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.