I have 2 dockers installed on my system, MariaDB and Plex. I recently installed newest update to each of them. Nobody was going to be using the server today, so to save a little power I decided to power down my system. I stopped my array and used the power down button on the GUI to activate a clean shutdown. When I rebooted my tower both my dockers were gone, their databases were still in my "appdata" share on my SSD. I had to reinstall the docker apps to get them back and allow my Kodi box to find the databases. Everything is working again but I have not tried shutting down again to see if they stay.