Solved
My Sims Saves keep deleting themselves
I play on Xbox one and this hasn’t happened to me until recently! I had a save game that I’d been playing for a while, with the packs Realm of Magic and Cottage Living and had no issues with my save...
As long as your Xbox is connected to the internet, it will load saves from the cloud storage onto your console. If you weren't prompted to sync this data up the next time you launched the game, then that means unfortunately the saves have been deleted from the cloud storage as well, and would not be recoverable.
In the future to prevent any save file corruption, I always recommend waiting a minute or two to close the game and power off your console after you've saved so the game has sufficient time to complete the save. In addition, if you have a large number of save files, you may have reached the capacity limit for saves on your console storage. Try reducing the number of save files to be sure no other saves become corrupt.
