Skyrim Special Edition backups should include mod context, not just bytes. The base .ess file is the core save, but SKSE installations can add a matching .skse cosave and the save can reference plugins that are no longer installed. That means a technically intact file may still fail or behave differently on another setup. SaveEditor.com therefore treats the save file, its optional cosave, and the mod/load-order context as separate pieces of compatibility evidence.
Start with the least destructive explanation
When The Elder Scrolls V: Skyrim Special Edition progress appears missing, first verify the active PC location: Windows: Steam: %USERPROFILE%DocumentsMy GamesSkyrim Special EditionSaves
GOG: %USERPROFILE%DocumentsMy GamesSkyrim Special Edition GOGSaves | Linux / Steam Play: Steam Play: <SteamLibrary-folder>/steamapps/compatdata/489830/pfx/. Expected files/folders: *.ess
*.skse (when created by SKSE). Many apparent save failures are actually profile, storefront, path-redirection, or cloud-selection problems rather than damaged game data.
Preserve every surviving copy
For an unmodded setup, back up the complete Saves folder. For SKSE/modded play, preserve matching .ess and .skse files plus a record of the mod list/load order. Before renaming, moving, replacing, or opening candidate backups, copy them outside the live directory. Do not use the only surviving file as the test specimen for repair or editing.
Check launcher and cloud state
Storefront context: Steam, GOG Galaxy, Epic Games Launcher, Microsoft Store / Xbox app. Steam and GOG use differently named Documents folders. Microsoft Store packaging differs and should not be treated as the same path simply because the game title is identical. Cloud notes: Steam Cloud, GOG Galaxy, Epic/Xbox cloud support, and optional OneDrive Documents backup can all affect which copy is restored. A sync client can reintroduce an older or newer version after a manual restore, so recovery work should keep local and cloud copies conceptually separate until the wanted progress is confirmed.
Use format and compatibility clues
Base saves use .ess. Modded installations using SKSE can create a paired .skse cosave with the same base name. Treat paired files as one restore set when the mod stack depends on them. Original Skyrim saves can sometimes be used by Special Edition, but modded saves may fail when required plugins are missing or incompatible. If the file exists but is ignored, compare the complete directory structure, slot/profile naming, game edition, mods/DLC, and any companion metadata. Do not assume an extension change or generic checksum tool can repair a game-specific container.
Game-specific troubleshooting
When a save fails after moving PCs, check the mod/plugin environment before assuming the .ess itself is corrupt. OneDrive can also redirect or synchronize the Documents folder unexpectedly. If a known-good backup works, preserve it and create a fresh in-game save before further experiments. If no copy works, prefer read-only inspection and source-backed game-specific tooling over repeated writes.
Verification context: Steam/GOG save paths, original-to-Special-Edition compatibility note, cloud support, and Steam Play behavior were reviewed against current PCGamingWiki coverage.