@r0se nfs works for files too large to deal with regular syncing/offloading (i.e. stream VODs), but my music workflow in particular really benefits from a more cloud sync-like setup.
i might give syncthing a proper peek, though opencloud was also recommended and seems pretty nice.
notably, while i mostly only use nextcloud for syncing files between devices, i do occasionally create fileshares for friends, so i'd like to keep that feature if at all possible.