Hey, it's me again. 
My setup is running since 9 month perfectly. (3 PIs in a network)
Now i want to export all important data on a new SD card with the new libreelec 10.0 version. (runs way much better than the older version on my PI4).
In quick, what do i have to copy from my old to my new system?
- mediasources.xml
- advancedsettings.xml
- sources.xml
How do i export the sql database?
Do i have to copy MyVideos116.db and rename it to the new current used DB?
What about Textures13.db?
And do i have to copy the whole Thumbnails folder?