I have been using my MCM in JBOD mode for a few months with no issues. I don’t have any apps installed nor am I using any of the ‘cloud’ functions. It is basically serving as an external hard drive for my Plex server.
The question is with a few months of adding, deleting, moving, renaming files is it time to defrag? I have just over 6,000 files on disk 1 and approaching a full state (3.11 TB per windows explorer properties).
I would assume a NAS isn’t much different from a HD installed in a PC that should occasionally have a defragmentation routine run to improve performance and storage capacity.