I keep Joplin in three different Linux machines and an Android. After some trepidation, it seems everything is working. Nevertheless, file sizes are different even thou they seem to have the same contents.
Those two databases should contain the same data and so it seems when visited, searched, etc. In spite of that, file sizes are quite different. (Yes, they are synchronized).
Maybe there is some leftover that could be eliminated?
Different note versions could be kept in different machines and not synchronized?