(If you abuse some form of user-mode init script, you can mount any number of remote network filesystems (in nfs) in the mycloud’s filesystem, which it would then be more than happy to make available over SMB… This is of course, less than desirable for a number of reasons. [poor latency, excessive network traffic generation, potential issues with sessions becoming dirty, and a number of others] That does not mean it is impossible though. Just, you really dont want to do it, even if you think you do. It might make sense to do that if the MyCloud had more than one ethernet interface, and you could segregate traffic, but the mycloud lacks such a feature. It is meant for home environments, not building a poor man’s SAN.)
Really, you just want to put some additional space available using USB hard disks in the case of the mycloud, like RAC8006 suggests.