I ran a Minecraft server unattended on my PC when I’m not home and when I came back to my PC, the server had crashed because the Playit.gg background service had used all of my C: drive storage. I traced it down to a log file in C:\ProgramData but all my storage only came back when I stopped the background service.
Update to 1.0.4 or later (currently on 1.0.5).