The built-in rolling .backupXX files are useful recovery evidence, but they should be copied before any rename/restore attempt. Preserve the entire account folder so all profiles and backups remain available.
For this PC reference, the documented storage is Windows: %USERPROFILE%DocumentsMarvel's Spider-Man Remastered<account-id>. The known file or folder pattern is slot*-s.save records and automatic .backupXX copies. Spider-Man Remastered stores profiles in a user-specific Documents subfolder and keeps rolling backup copies with the save slots. Preserve backups before renaming or restoring one.
Backup guidance: Close Marvel's Spider-Man Remastered, let the launcher finish any synchronization, then copy the complete documented save directory to a dated folder outside the live path. Preserve companion files rather than selecting only the newest-looking record. Cloud sync can replace local progress; Nixxes documents the Documents folder as the place to collect save files for support. Launcher and cloud context matters because The active Steam, Epic Games Store installation determines which local profile and cloud copy can overwrite the save. Identify the storefront and account before restoring files.
Compatibility and recovery should stay conservative. Treat saves as version-, storefront-, account-, and mod-sensitive unless the game or a separately verified migration workflow proves otherwise. A similar filename or extension is not evidence that two releases are interchangeable. If the expected progress is not visible, If progress is missing after a restore, confirm the active Windows account, storefront/profile, cloud state, and exact directory first. Restore the untouched backup before experimenting with individual files or older autosaves. 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.