The Sims 4 already keeps several recovery generations next to each main slot, which makes indiscriminate cleanup a mistake. A good backup preserves the whole saves directory, including `.save.ver0` through `.ver4` files. If a slot becomes unusable, duplicate the directory first and test recovery on the copy. Also remember that the Documents tree may be redirected or synchronized by OneDrive, so the file you replace locally may not be the only copy involved.
Which storefront context matters
Documented The Sims 4 PC launchers/storefronts: EA app, Steam, Epic Games Launcher. The active Windows saves still live under Documents/Electronic Arts. Steam and Epic launch through EA services but should not be assumed to maintain a separate independent save directory. 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
OneDrive Documents backup can synchronize or redirect the saves directory when enabled. Treat that as a second copy source when diagnosing unexpected restores. 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: %USERPROFILE%DocumentsElectronic ArtsThe Sims 4saves | macOS: $HOME/Documents/Electronic Arts/The Sims 4/saves/ | Linux / Steam Play: Steam Play: <SteamLibrary-folder>/steamapps/compatdata/1222670/pfx/; the known file or folder pattern is Slot_*.save
Slot_*.save.ver0 … .ver4. 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 complete saves directory so each main slot and its .ver0-.ver4 recovery generations remain together. 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
The save can depend on installed packs, custom content, and mods. Missing content after migration is not the same as binary save corruption. If progress disappears or rolls back, If a main Slot file fails, preserve it first, then work from a copied .save.verN generation. Do not rename over every version until one recovery copy has been tested. 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: Windows/macOS/Steam Play save paths and storefront/OneDrive context were reviewed against current PCGamingWiki coverage. Rotating Slot recovery filenames follow the standard Sims 4 desktop layout.