Your save data is more important than a mod installation. The easiest protection is to copy the whole gamesaves folder somewhere outside a synced Documents folder before changing anything.
On Windows, open %USERPROFILE%\Documents\The Witcher 3\gamesaves. Back up the whole folder—or matching .sav and .png pairs—into a dated folder outside OneDrive and Steam’s cloud-managed paths. Keep the original untouched until the new installation works.
If Windows redirects Documents into OneDrive, the actual gamesaves folder can live in your OneDrive Documents path. Confirm the current Windows Documents location before restoring anything.See the fix before you change anything
Copy the Windows save-file path
Game save data; keep every file.
Matching save thumbnails; preserve them too.
The simplest way to solve it
Close the game and locate Documents
Quit The Witcher 3. Paste the save path from the tool into File Explorer, or use Documents → The Witcher 3 → gamesaves.
Back up every matching file
Copy the entire gamesaves folder to a dated folder on a different drive or a local folder outside cloud sync. Keep both save and thumbnail files.
Check for OneDrive redirection
Right-click Documents → Properties → Location (where supported), or open it in File Explorer and inspect its address. If OneDrive manages it, note that location before restoring.
Verify Steam Cloud without forcing overwrite
Wait for Steam sync to finish and compare save timestamps. Never accept a cloud-versus-local overwrite unless you know which copy is newer.
Restore only after a clean test
After installing a mod or upgrading, load the game once without deleting your backup. Restore by copying into the active gamesaves directory while the game is closed.
Before you finish
Test the same scene or screen after making a single change. If a setting or mod does not help, restore your previous version. The interactive tools on this webpage do not change game files.
Frequently asked questions
Where are PC save files?
Typically under Documents\The Witcher 3\gamesaves in your Windows profile.
Why are there .sav and .png files?
.sav stores the game progress and matching .png files are save thumbnails.
Does uninstalling the game always erase saves?
Not always; save folders may be preserved or synced, but never rely on that in place of a backup.
Can OneDrive move the Documents folder?
Yes. Windows can redirect Documents to OneDrive, changing where the game reads and writes files.
Should I disable Steam Cloud permanently?
Not usually. First create an independent backup and resolve conflicting timestamps carefully.
References
- https://www.pcgamingwiki.com/wiki/The_Witcher_3
- https://steamdb.info/app/292030/ufs/
- https://support.cdprojektred.com/en/witcher-3/xbox/sp-technical/issue/2389/how-to-use-cross-progression
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