I just tried to run TTS Mod Backup 2.0.18 (uploaded to NexusMods on 3/26/20), and it seems that TTS 12.3 broke it. I now get this error message when I launch the app: "Could not load type 'VersionDeserializationBinder' from assembly 'Assembly-CSharp, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'." I get this error when I launch the app, as it is reading the mod list. I removed the SettingsCat file and it gives the same error. It worked just a few days ago, so I suspect it has something to do with TTS 12.3 which was just released today. Other than this hiccup, this app has been working very well. Thank you for creating it!