Right now, if you delete a Proton game, all the saved games are permanently lost.
Instead Steam Cloud could sync, under the folder "steamapps/compatdata", the contents of "drive_c/users/steamuser".
Hello @es20490446e, this issue is already being tracked at #428 / #231. Closing as a duplicate.
Nothing extracted yet.
Right now, if you delete a Proton game, all the saved games are permanently lost.
Instead Steam Cloud could sync, under the folder "steamapps/compatdata", the contents of "drive_c/users/steamuser".