Thanks for the 'Previous Apps' hint, I wasn't aware of it. I don't remember the exact changes I did on default configuration but I changed the docker folder location for sure since I wanted to make sure that it is stored on SSD and not HDD. However, I decided to disable docker, renamed the docker and appdata folder, enabled docker again and added containers using templates. After that, I copied old appdata content and adjusted user/group/permissions accordingly. Everything is running fine again now. Thanks again.