I logged in a couple days ago, after the patch, didn't try to use the tool to move my stuff from Legacy to Play, just clicked on Legacy.
Everything I had was gone. Chars, Gold, Items, Progress (it offers me to play the tutorial again).
I have a level 1 Squire named Hamlet that I didn't create.
I had never played on "Play" before this, but checked to see if maybe my stuff was automatically transferred. It wasn't, but I do have the exact same char there.
I couldn't get any help on Discord (even though some people reported similar losses) and also got nothing from CG's Support so far. Did this happen to anyone else? Is there a way to backup the files locally so in case something happens server side we can just have it on our own machines? I remember that sometimes we'd randomly lose our stuff on the original Dungeon Defenders, but Trendy had backups. I hope this is still true.