Persona 3 Reload has unusually useful public Steam Cloud metadata: SteamDB shows the exact WinAppDataRoaming root and SaveData*.sav pattern. That makes the Steam backup boundary clear, but it does not solve Microsoft Store compatibility because the Game Pass version lives in WGS and community transfer workflows use conversion/encryption-aware tools. SaveEditor therefore documents both locations while explicitly separating “where the file is” from “whether it is directly compatible.” A safe migration starts with a complete backup of both source and target directories.
Where Persona 3 Reload stores PC saves
The researched save-location boundary is Windows: Steam: %APPDATA%SEGAP3RSteam<64-bit-SteamID> ; Microsoft Store: %LOCALAPPDATA%PackagesSEGAofAmericaInc.L0cb6b3aea_s751p9cej88mtSystemAppDatawgs<user-id>. The known file or folder pattern is Steam: SaveData*.sav; Microsoft Store: opaque WGS files/containers.. This is the practical starting point because launcher, profile, and storefront context can change which copy is active even when two folders look similar.
Storefront and profile differences
Documented launchers or storefronts: Steam, Microsoft Store. The Steam and Microsoft Store save containers are not equivalent. Do not rename an arbitrary WGS file to SaveData001.sav and assume it is valid. When looking for a missing save, identify the executable/storefront you actually launched and the user/profile that created the progress before copying anything between directories.
Cloud synchronization
Steam Cloud and Xbox Cloud are documented. SteamDB reports a 550 MiB cloud quota and the SaveData*.sav pattern for Steam. A cloud service should be treated as another copy of the save, not as proof that the local folder is disposable. Before a manual restore, let synchronization finish, make an offline backup, and avoid starting the game while files are being replaced.
What the files represent
Steam cloud configuration explicitly maps WinAppDataRoaming/SEGA/P3R/Steam/{64BitSteamID} with a SaveData*.sav pattern. Microsoft Store uses WGS and transfer to Steam may require format/encryption-aware tooling. The current filename/folder evidence is Steam: SaveData*.sav; Microsoft Store: opaque WGS files/containers.. File-extension context: .sav A location guide does not claim that every file in the directory is safe to edit or that files from another storefront are automatically interchangeable.
If the save is not where expected
If Steam does not show an imported slot, confirm the 64-bit Steam ID folder and SaveData numbering. For Microsoft Store migration, restore the original WGS copy if a conversion tool fails. Also check redirected Documents folders, Steam Play prefixes, account IDs, and launcher-specific containers where applicable. Preserve every candidate copy before testing a restore so troubleshooting does not destroy the only surviving version.
Verification context: Reviewed against PCGamingWiki Persona 3 Reload and current SteamDB user-file-system mapping for app 2161700.