the move seemed to work, since my internal storage went up 2.6GB (from 6GB to 8,7GB).
after that configuration (!!!) I installed via the software options Plex Media server and started to add my Movie and TV library. it said before installing, that the user data location is “custom” and pointed to my external 1TB Data:
during initial scan a lot of meta data is downloaded via PLEX. and my guess was, that all this meta data will be downloaded to the new dietpi_userdata location and does not fill up my limited internal storage.
Unfortunately my internal storage went down another 1.6GB so it seems the plex meta data is still been loaded on the internal storage, rather than the external 1TB Storage which I said is the new dietpi_userdata?
I went into my new User_data Folder on the External 1TB Drive and did not found any “Plex” folder.