My steam cloud storage shows me that i have 150mb/0bytesIt sounds like you've used up all of your Steam cloud storage - you should see if Steam has a way to manage what is in the cloud. I'm afraid this is not something that you can fix within Terraria.
Yep, that confirms it - this is an issue on steam's end. You should contact steam support.My steam cloud storage shows me that i have 150mb/0bytesView attachment 334951