Steam users can check the log file ( C:\Program…\Steam\logs\cloud_log.txt ) related to strange things. But I expect that MSFS determined that somewhat is out of date and created new files, which Steam then takes as given from the App. No idea why MSFS think the files are out of date, if your system time is not strange ( or there was a connection lost which msfs wrong interpreted ).
Here you find the local cache of the steam cloud files ( possible backup from time to time if the hours of flight important ):
C:\Program…\Steam\userdata\xxyourusernumberxx\1250410
( 125… is MSFS app nr )
Here the online version: https://store.steampowered.com/account/remotestorage
There is no history, but with a local backup you can replace local files with an older version and steam ask then which file you want to use.