dr.zeissler, on 08 December 2019 - 01:06 AM, said:
Does anyone know what essential files are in the "application-support/steam" beside the downloaded games?
Not really. There are a few games where the saved gamestates are in the game's individual folder and hence technically in there, but when you plan to move the whole games, that shouldn't be a problem.
If I would only copy some games and not all, what files beside the game do I need?
You'll need the manifest file from ~/Application Support/Steam/SteamApps/ and the game's folder from the "common" subfolder at that location. The manifest file is called something like "appmanifest_49520.acf" where the number (49520 in this case) is the AppID of the game, here Borderlands 2. You can find that number either on sites like SteamDB
or simply in the URL of the Steam store page of that game, e.g. https://store.steampowered.com/app/49520