Steam restore
I recently had to do a complete system reinstall. Operating system applications games and everything else after a major hardware failure. And since Steam game data is not a priority, I didn't have a local backup of it. It did take a little while but steam did restore everything that I subscribe to. I just logged into my Steam account and left it on overnight one night and it updated while I slept and the next day everything I subscribed to, thousands and thousands of subscriptions, were restored. So depending on if you're running the game or not at the same time, and your internet connection, I can see if things are coming back slowly. But they will ultimately come back. That's one of the major reasons why I do like Steam connected to this game. In my case, since I do not backup game data locally because Steam already holds everything for me, having steam there in cases like my catastrophic failure is a godsend.