Security and firewalls are a concern for all TCP/IP communication; FTP isn't secure, but that's not relevant here. Given the use of SSH, SFTP could be used, which should add no security concerns. As for using FTP as a model, the key point is having a different session for the binary data. As for performance, I don't think you can assume that a new session per blob is going to be a major factor. It depends on the average size of those blobs. Anyway, as the original poster noted, a single separate data session would likely serve his purpose.
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