The HD Remaster is one PC product but it contains several distinct save contexts, so backing up only the first save-looking file is risky. Steam places the collection under one Documents root; Microsoft Store uses WGS. SaveEditor recommends preserving the collection root and labeling the backup with which component game and slot were active. That matters when troubleshooting because Final Fantasy X, X-2, and Last Mission can each have their own progress while sharing the same installation and launcher.
Which storefront context matters
Documented Final Fantasy X/X-2 HD Remaster PC launchers/storefronts: Steam, Microsoft Store. Do not assume a save from FFX belongs in the same subfolder as X-2 or Last Mission. Microsoft Store container names are not user-friendly filenames. The active storefront/account should be identified before any restore because cloud and local storage may not use the same path or container across editions.
Documented cloud behavior
Steam Cloud and Xbox Cloud are documented; OneDrive can also synchronize the Documents root when enabled. Cloud synchronization is useful for continuity, but it can also turn a restore into a conflict-resolution event. Let synchronization settle before making a manual backup, and keep an offline copy outside any folder monitored by the launcher or operating-system sync service.
Local save roots still matter
The researched local save boundary is Windows: Steam: %USERPROFILE%DocumentsSQUARE ENIXFINAL FANTASY X&X-2 HD Remaster ; Microsoft Store: %LOCALAPPDATA%Packages39EA002F.FFXX-2HDRemaster_n746a19ndrrjgSystemAppDatawgs 009000000B904E5_0000000000000000000000006038DDC9<container>; the known file or folder pattern is Separate game-specific save data exists beneath the remaster root for Final Fantasy X, X-2, and Last Mission.. A cloud-enabled game still has concrete local data involved in ordinary play, and that local context is what you need when identifying which copy was modified most recently.
Avoid accidental overwrite loops
Copy the whole FINAL FANTASY X&X-2 HD Remaster directory on Steam so all game-specific subfolders and system data remain together. For WGS, preserve the complete container tree. When restoring, close the game and launcher, preserve both the current local copy and the backup you want to test, then place the intended data in the matching profile/storefront location. Do not repeatedly open the game between different copies without noting which side the cloud client selected.
Compatibility and conflict checks
A backup for one title in the collection should not overwrite another title’s data. Steam and Microsoft Store use different storage containers even when the underlying game progress is related. If progress disappears or rolls back, If a save appears absent, confirm whether you launched X, X-2, or Last Mission and whether OneDrive/Steam Cloud restored a different Documents copy. Microsoft Store users should verify the correct WGS account container. Resolve identity/path/cloud questions first. A cloud conflict is not proof that the save itself is corrupt, and a successful upload is not proof that files from another storefront are compatible.
Verification context: Reviewed against current PCGamingWiki Final Fantasy X/X-2 HD Remaster save-location and cloud documentation.