Borderlands 2 is a multi-file account save. Copy the numbered/account directory as one unit so character saves, profile.bin, and recovery .bak files remain together.
For this PC reference, the documented storage is Windows: %USERPROFILE%DocumentsMy GamesBorderlands 2WillowGameSaveData<account-id>. The known file or folder pattern is SaveXXXX.sav character files, profile.bin, and .bak copies when present. Borderlands 2 separates character .sav files from shared profile.bin data inside an account directory. Backing up only one character can omit account-wide progression or keys.
Backup guidance: Close Borderlands 2, 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. Steam/Epic cloud synchronization can overwrite local character/profile data; preserve the whole account folder offline first. 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.