Sekiro uses one profile-level S0000.sl2 file, so a file replacement can roll back several in-game slots at once. The safest routine is therefore simple but strict: close the game, copy the whole account-ID directory, keep more than one dated generation, and only then experiment. Steam Cloud is another revision source; if a manual restore appears to revert itself, solve the synchronization conflict before overwriting the folder again.
Prepare the source PC
On the source system, identify the actual Sekiro: Shadows Die Twice save root: Windows: %APPDATA%Sekiro<user-id>S0000.sl2 | Linux / Steam Play: Steam Play: <SteamLibrary-folder>/steamapps/compatdata/814380/pfx/. The expected file/folder pattern is S0000.sl2. Close the game, let the active launcher finish writing and synchronizing, then make a complete offline copy rather than transferring a file that may still be open.
Preserve storefront and profile identity
Documented storefronts: Steam. The user-ID directory is part of the save context. Do not assume a copied S0000.sl2 belongs to the active Steam identity. A transfer between two PCs is simplest when both systems use the same storefront/account/profile context. If the destination uses a different store or container, treat that as a migration problem rather than an ordinary restore.
Move the complete save boundary
Copy the entire Sekiro account-ID folder with the game closed. Keep multiple dated versions because the game continually updates the same container. Put the copied data on the destination only after confirming the destination save path. If the game creates a new empty save first, keep that new folder as another backup so you can compare structures and revert.
Handle cloud sync deliberately
Steam Cloud is documented. Decide whether the local transferred copy or cloud copy should be authoritative before launching the game. If possible, preserve both. After the transferred save loads correctly, make a fresh in-game save and let the launcher synchronize normally.
Check compatibility before blaming the transfer
The Steam PC profile is a single S0000.sl2 container under an account-ID directory. Multiple in-game slots are not separate operating-system files. Compatibility note: One .sl2 container can hold multiple in-game slots. File-level replacement rolls back the profile container, not one isolated character slot. If the destination does not see the transferred progress, If a restore is replaced on launch, compare Steam Cloud state and modification times. Keep the original local file before testing any imported container. Verify game edition/version, store, profile IDs, redirected folders, and mod/DLC dependencies before editing the save itself.
Verification context: Windows path, S0000.sl2 filename, Steam Play behavior, and Steam Cloud support were reviewed against current PCGamingWiki coverage.