Xbox One’s cloud saves automatically sync while you are logged into your profile. In the event a save was manually overwritten or deleted by the player, or if the save data becomes corrupted and uploaded to the cloud, this save data cannot be recovered.
Please note Monster Hunter: World save data is not stored on the game’s servers; all save data is stored via the Xbox Live cloud and your local hard drive. Capcom is unable to provide nor create save data in the event a user's save data is lost. For more information on Xbox One cloud game saves, please read the Xbox Support FAQ below: