Dark Souls Remastered also stores several character slots inside one .sl2 profile container. A reliable backup therefore captures DRAKS0005.sl2 at the profile level and keeps the numeric user folder context. Steam Cloud can help, but it should not be the only copy before a mod, manager, or migration. SaveEditor.com does not describe one character as an independent file because that would misrepresent the container structure.
For this PC reference, the documented storage is Windows: %USERPROFILE%DocumentsNBGIDARK SOULS REMASTERED<user-id> | Linux / Steam Play: Steam Play: <SteamLibrary-folder>/steamapps/compatdata/570940/pfx/. The known file or folder pattern is DRAKS0005.sl2. The Windows profile uses a single DRAKS0005.sl2 container under the NBGI account directory. Multiple in-game characters can live inside the same file.
Backup guidance: Copy DRAKS0005.sl2 and preferably the complete numeric profile folder. Steam Cloud is documented for Dark Souls Remastered, but a manual dated copy is still recommended before experimentation. Launcher and cloud context matters because The account-specific numeric directory matters. Keep the directory level when moving backups between PCs.
Compatibility and recovery should stay conservative. File replacement affects the whole profile container. Character-level merging requires a dedicated parser and is not implied by this Game Hub. If the expected progress is not visible, If an imported profile does not appear, verify that it is inside the correct numeric account folder and that cloud synchronization did not restore another revision. 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.