The information Hellboythegreat gave is also confirmed by the Steam support site. https://support.steampowered.com/kb_article.php?ref=7418-YUBN-8129

Steam also has a backup feature. However, it doesn't automatically backup saved games, custom maps or config files. You have to do that manually. In my opinion, transferring the entire installation seems less tedious.
https://support.steampowered.com/kb_article.php?ref=8794-YPHV-2033

To manually copy saved games, custom maps, etc.
1. Copy all the files in the cfg, downloads, maps, materials, SAVE folders. Each game has its own set of these folders... And you have to do this for every game you want to back up.
2. When restoring backups, copy all the folders back into the corresponding game folder!

To create a backup file:
1. Right-click the game you want to backup under the My Games tab.
2. Select Backup game files...
3. Select all the other games you want to backup and click Next.
4. Select the folder you want to save your backup to. Click Next.
5. You can then move the backup files to a different location or burn them to disc.

To restore the files:
1. Install Steam.
2. Click on the steambackup.exe that was created automatically in the backup folder.
3. Click the top link in the Steam Backup window to load the Restore backup window.
4. Select the games you want to restore. Click Next.
4. Click Next again. Click Finish.

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